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//===--- RewriteObjC.cpp - Playground for the code rewriter ---------------===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// Hacks and fun related to the code rewriter.
//
//===----------------------------------------------------------------------===//
#include "clang/Rewrite/Frontend/ASTConsumers.h"
#include "clang/AST/AST.h"
#include "clang/AST/ASTConsumer.h"
#include "clang/AST/Attr.h"
#include "clang/AST/ParentMap.h"
#include "clang/Basic/CharInfo.h"
#include "clang/Basic/Diagnostic.h"
#include "clang/Basic/IdentifierTable.h"
#include "clang/Basic/SourceManager.h"
#include "clang/Lex/Lexer.h"
#include "clang/Rewrite/Core/Rewriter.h"
#include "llvm/ADT/DenseSet.h"
#include "llvm/ADT/SmallPtrSet.h"
#include "llvm/ADT/StringExtras.h"
#include "llvm/Support/MemoryBuffer.h"
#include "llvm/Support/raw_ostream.h"
#include <memory>
#ifdef CLANG_ENABLE_OBJC_REWRITER
using namespace clang;
using llvm::utostr;
namespace {
class RewriteObjC : public ASTConsumer {
protected:
enum {
BLOCK_FIELD_IS_OBJECT = 3, /* id, NSObject, __attribute__((NSObject)),
block, ... */
BLOCK_FIELD_IS_BLOCK = 7, /* a block variable */
BLOCK_FIELD_IS_BYREF = 8, /* the on stack structure holding the
__block variable */
BLOCK_FIELD_IS_WEAK = 16, /* declared __weak, only used in byref copy
helpers */
BLOCK_BYREF_CALLER = 128, /* called from __block (byref) copy/dispose
support routines */
BLOCK_BYREF_CURRENT_MAX = 256
};
enum {
BLOCK_NEEDS_FREE = (1 << 24),
BLOCK_HAS_COPY_DISPOSE = (1 << 25),
BLOCK_HAS_CXX_OBJ = (1 << 26),
BLOCK_IS_GC = (1 << 27),
BLOCK_IS_GLOBAL = (1 << 28),
BLOCK_HAS_DESCRIPTOR = (1 << 29)
};
static const int OBJC_ABI_VERSION = 7;
Rewriter Rewrite;
DiagnosticsEngine &Diags;
const LangOptions &LangOpts;
ASTContext *Context;
SourceManager *SM;
TranslationUnitDecl *TUDecl;
FileID MainFileID;
const char *MainFileStart, *MainFileEnd;
Stmt *CurrentBody;
ParentMap *PropParentMap; // created lazily.
std::string InFileName;
raw_ostream* OutFile;
std::string Preamble;
TypeDecl *ProtocolTypeDecl;
VarDecl *GlobalVarDecl;
unsigned RewriteFailedDiag;
// ObjC string constant support.
unsigned NumObjCStringLiterals;
VarDecl *ConstantStringClassReference;
RecordDecl *NSStringRecord;
// ObjC foreach break/continue generation support.
int BcLabelCount;
unsigned TryFinallyContainsReturnDiag;
// Needed for super.
ObjCMethodDecl *CurMethodDef;
RecordDecl *SuperStructDecl;
RecordDecl *ConstantStringDecl;
FunctionDecl *MsgSendFunctionDecl;
FunctionDecl *MsgSendSuperFunctionDecl;
FunctionDecl *MsgSendStretFunctionDecl;
FunctionDecl *MsgSendSuperStretFunctionDecl;
FunctionDecl *MsgSendFpretFunctionDecl;
FunctionDecl *GetClassFunctionDecl;
FunctionDecl *GetMetaClassFunctionDecl;
FunctionDecl *GetSuperClassFunctionDecl;
FunctionDecl *SelGetUidFunctionDecl;
FunctionDecl *CFStringFunctionDecl;
FunctionDecl *SuperConstructorFunctionDecl;
FunctionDecl *CurFunctionDef;
FunctionDecl *CurFunctionDeclToDeclareForBlock;
/* Misc. containers needed for meta-data rewrite. */
SmallVector<ObjCImplementationDecl *, 8> ClassImplementation;
SmallVector<ObjCCategoryImplDecl *, 8> CategoryImplementation;
llvm::SmallPtrSet<ObjCInterfaceDecl*, 8> ObjCSynthesizedStructs;
llvm::SmallPtrSet<ObjCProtocolDecl*, 8> ObjCSynthesizedProtocols;
llvm::SmallPtrSet<ObjCInterfaceDecl*, 8> ObjCForwardDecls;
llvm::DenseMap<ObjCMethodDecl*, std::string> MethodInternalNames;
SmallVector<Stmt *, 32> Stmts;
SmallVector<int, 8> ObjCBcLabelNo;
// Remember all the @protocol(<expr>) expressions.
llvm::SmallPtrSet<ObjCProtocolDecl *, 32> ProtocolExprDecls;
llvm::DenseSet<uint64_t> CopyDestroyCache;
// Block expressions.
SmallVector<BlockExpr *, 32> Blocks;
SmallVector<int, 32> InnerDeclRefsCount;
SmallVector<DeclRefExpr *, 32> InnerDeclRefs;
SmallVector<DeclRefExpr *, 32> BlockDeclRefs;
// Block related declarations.
SmallVector<ValueDecl *, 8> BlockByCopyDecls;
llvm::SmallPtrSet<ValueDecl *, 8> BlockByCopyDeclsPtrSet;
SmallVector<ValueDecl *, 8> BlockByRefDecls;
llvm::SmallPtrSet<ValueDecl *, 8> BlockByRefDeclsPtrSet;
llvm::DenseMap<ValueDecl *, unsigned> BlockByRefDeclNo;
llvm::SmallPtrSet<ValueDecl *, 8> ImportedBlockDecls;
llvm::SmallPtrSet<VarDecl *, 8> ImportedLocalExternalDecls;
llvm::DenseMap<BlockExpr *, std::string> RewrittenBlockExprs;
// This maps an original source AST to it's rewritten form. This allows
// us to avoid rewriting the same node twice (which is very uncommon).
// This is needed to support some of the exotic property rewriting.
llvm::DenseMap<Stmt *, Stmt *> ReplacedNodes;
// Needed for header files being rewritten
bool IsHeader;
bool SilenceRewriteMacroWarning;
bool objc_impl_method;
bool DisableReplaceStmt;
class DisableReplaceStmtScope {
RewriteObjC &R;
bool SavedValue;
public:
DisableReplaceStmtScope(RewriteObjC &R)
: R(R), SavedValue(R.DisableReplaceStmt) {
R.DisableReplaceStmt = true;
}
~DisableReplaceStmtScope() {
R.DisableReplaceStmt = SavedValue;
}
};
void InitializeCommon(ASTContext &context);
public:
// Top Level Driver code.
bool HandleTopLevelDecl(DeclGroupRef D) override {
for (DeclGroupRef::iterator I = D.begin(), E = D.end(); I != E; ++I) {
if (ObjCInterfaceDecl *Class = dyn_cast<ObjCInterfaceDecl>(*I)) {
if (!Class->isThisDeclarationADefinition()) {
RewriteForwardClassDecl(D);
break;
}
}
if (ObjCProtocolDecl *Proto = dyn_cast<ObjCProtocolDecl>(*I)) {
if (!Proto->isThisDeclarationADefinition()) {
RewriteForwardProtocolDecl(D);
break;
}
}
HandleTopLevelSingleDecl(*I);
}
return true;
}
void HandleTopLevelSingleDecl(Decl *D);
void HandleDeclInMainFile(Decl *D);
RewriteObjC(std::string inFile, raw_ostream *OS,
DiagnosticsEngine &D, const LangOptions &LOpts,
bool silenceMacroWarn);
~RewriteObjC() override {}
void HandleTranslationUnit(ASTContext &C) override;
void ReplaceStmt(Stmt *Old, Stmt *New) {
ReplaceStmtWithRange(Old, New, Old->getSourceRange());
}
void ReplaceStmtWithRange(Stmt *Old, Stmt *New, SourceRange SrcRange) {
assert(Old != nullptr && New != nullptr && "Expected non-null Stmt's");
Stmt *ReplacingStmt = ReplacedNodes[Old];
if (ReplacingStmt)
return; // We can't rewrite the same node twice.
if (DisableReplaceStmt)
return;
// Measure the old text.
int Size = Rewrite.getRangeSize(SrcRange);
if (Size == -1) {
Diags.Report(Context->getFullLoc(Old->getLocStart()), RewriteFailedDiag)
<< Old->getSourceRange();
return;
}
// Get the new text.
std::string SStr;
llvm::raw_string_ostream S(SStr);
New->printPretty(S, nullptr, PrintingPolicy(LangOpts));
const std::string &Str = S.str();
// If replacement succeeded or warning disabled return with no warning.
if (!Rewrite.ReplaceText(SrcRange.getBegin(), Size, Str)) {
ReplacedNodes[Old] = New;
return;
}
if (SilenceRewriteMacroWarning)
return;
Diags.Report(Context->getFullLoc(Old->getLocStart()), RewriteFailedDiag)
<< Old->getSourceRange();
}
void InsertText(SourceLocation Loc, StringRef Str,
bool InsertAfter = true) {
// If insertion succeeded or warning disabled return with no warning.
if (!Rewrite.InsertText(Loc, Str, InsertAfter) ||
SilenceRewriteMacroWarning)
return;
Diags.Report(Context->getFullLoc(Loc), RewriteFailedDiag);
}
void ReplaceText(SourceLocation Start, unsigned OrigLength,
StringRef Str) {
// If removal succeeded or warning disabled return with no warning.
if (!Rewrite.ReplaceText(Start, OrigLength, Str) ||
SilenceRewriteMacroWarning)
return;
Diags.Report(Context->getFullLoc(Start), RewriteFailedDiag);
}
// Syntactic Rewriting.
void RewriteRecordBody(RecordDecl *RD);
void RewriteInclude();
void RewriteForwardClassDecl(DeclGroupRef D);
void RewriteForwardClassDecl(const SmallVectorImpl<Decl *> &DG);
void RewriteForwardClassEpilogue(ObjCInterfaceDecl *ClassDecl,
const std::string &typedefString);
void RewriteImplementations();
void RewritePropertyImplDecl(ObjCPropertyImplDecl *PID,
ObjCImplementationDecl *IMD,
ObjCCategoryImplDecl *CID);
void RewriteInterfaceDecl(ObjCInterfaceDecl *Dcl);
void RewriteImplementationDecl(Decl *Dcl);
void RewriteObjCMethodDecl(const ObjCInterfaceDecl *IDecl,
ObjCMethodDecl *MDecl, std::string &ResultStr);
void RewriteTypeIntoString(QualType T, std::string &ResultStr,
const FunctionType *&FPRetType);
void RewriteByRefString(std::string &ResultStr, const std::string &Name,
ValueDecl *VD, bool def=false);
void RewriteCategoryDecl(ObjCCategoryDecl *Dcl);
void RewriteProtocolDecl(ObjCProtocolDecl *Dcl);
void RewriteForwardProtocolDecl(DeclGroupRef D);
void RewriteForwardProtocolDecl(const SmallVectorImpl<Decl *> &DG);
void RewriteMethodDeclaration(ObjCMethodDecl *Method);
void RewriteProperty(ObjCPropertyDecl *prop);
void RewriteFunctionDecl(FunctionDecl *FD);
void RewriteBlockPointerType(std::string& Str, QualType Type);
void RewriteBlockPointerTypeVariable(std::string& Str, ValueDecl *VD);
void RewriteBlockLiteralFunctionDecl(FunctionDecl *FD);
void RewriteObjCQualifiedInterfaceTypes(Decl *Dcl);
void RewriteTypeOfDecl(VarDecl *VD);
void RewriteObjCQualifiedInterfaceTypes(Expr *E);
// Expression Rewriting.
Stmt *RewriteFunctionBodyOrGlobalInitializer(Stmt *S);
Stmt *RewriteAtEncode(ObjCEncodeExpr *Exp);
Stmt *RewritePropertyOrImplicitGetter(PseudoObjectExpr *Pseudo);
Stmt *RewritePropertyOrImplicitSetter(PseudoObjectExpr *Pseudo);
Stmt *RewriteAtSelector(ObjCSelectorExpr *Exp);
Stmt *RewriteMessageExpr(ObjCMessageExpr *Exp);
Stmt *RewriteObjCStringLiteral(ObjCStringLiteral *Exp);
Stmt *RewriteObjCProtocolExpr(ObjCProtocolExpr *Exp);
void RewriteTryReturnStmts(Stmt *S);
void RewriteSyncReturnStmts(Stmt *S, std::string buf);
Stmt *RewriteObjCTryStmt(ObjCAtTryStmt *S);
Stmt *RewriteObjCSynchronizedStmt(ObjCAtSynchronizedStmt *S);
Stmt *RewriteObjCThrowStmt(ObjCAtThrowStmt *S);
Stmt *RewriteObjCForCollectionStmt(ObjCForCollectionStmt *S,
SourceLocation OrigEnd);
Stmt *RewriteBreakStmt(BreakStmt *S);
Stmt *RewriteContinueStmt(ContinueStmt *S);
void RewriteCastExpr(CStyleCastExpr *CE);
// Block rewriting.
void RewriteBlocksInFunctionProtoType(QualType funcType, NamedDecl *D);
// Block specific rewrite rules.
void RewriteBlockPointerDecl(NamedDecl *VD);
void RewriteByRefVar(VarDecl *VD);
Stmt *RewriteBlockDeclRefExpr(DeclRefExpr *VD);
Stmt *RewriteLocalVariableExternalStorage(DeclRefExpr *DRE);
void RewriteBlockPointerFunctionArgs(FunctionDecl *FD);
void RewriteObjCInternalStruct(ObjCInterfaceDecl *CDecl,
std::string &Result);
void Initialize(ASTContext &context) override = 0;
// Metadata Rewriting.
virtual void RewriteMetaDataIntoBuffer(std::string &Result) = 0;
virtual void RewriteObjCProtocolListMetaData(const ObjCList<ObjCProtocolDecl> &Prots,
StringRef prefix,
StringRef ClassName,
std::string &Result) = 0;
virtual void RewriteObjCCategoryImplDecl(ObjCCategoryImplDecl *CDecl,
std::string &Result) = 0;
virtual void RewriteObjCProtocolMetaData(ObjCProtocolDecl *Protocol,
StringRef prefix,
StringRef ClassName,
std::string &Result) = 0;
virtual void RewriteObjCClassMetaData(ObjCImplementationDecl *IDecl,
std::string &Result) = 0;
// Rewriting ivar access
virtual Stmt *RewriteObjCIvarRefExpr(ObjCIvarRefExpr *IV) = 0;
virtual void RewriteIvarOffsetComputation(ObjCIvarDecl *ivar,
std::string &Result) = 0;
// Misc. AST transformation routines. Sometimes they end up calling
// rewriting routines on the new ASTs.
CallExpr *SynthesizeCallToFunctionDecl(FunctionDecl *FD,
Expr **args, unsigned nargs,
SourceLocation StartLoc=SourceLocation(),
SourceLocation EndLoc=SourceLocation());
CallExpr *SynthMsgSendStretCallExpr(FunctionDecl *MsgSendStretFlavor,
QualType msgSendType,
QualType returnType,
SmallVectorImpl<QualType> &ArgTypes,
SmallVectorImpl<Expr*> &MsgExprs,
ObjCMethodDecl *Method);
Stmt *SynthMessageExpr(ObjCMessageExpr *Exp,
SourceLocation StartLoc=SourceLocation(),
SourceLocation EndLoc=SourceLocation());
void SynthCountByEnumWithState(std::string &buf);
void SynthMsgSendFunctionDecl();
void SynthMsgSendSuperFunctionDecl();
void SynthMsgSendStretFunctionDecl();
void SynthMsgSendFpretFunctionDecl();
void SynthMsgSendSuperStretFunctionDecl();
void SynthGetClassFunctionDecl();
void SynthGetMetaClassFunctionDecl();
void SynthGetSuperClassFunctionDecl();
void SynthSelGetUidFunctionDecl();
void SynthSuperConstructorFunctionDecl();
std::string SynthesizeByrefCopyDestroyHelper(VarDecl *VD, int flag);
std::string SynthesizeBlockHelperFuncs(BlockExpr *CE, int i,
StringRef funcName, std::string Tag);
std::string SynthesizeBlockFunc(BlockExpr *CE, int i,
StringRef funcName, std::string Tag);
std::string SynthesizeBlockImpl(BlockExpr *CE,
std::string Tag, std::string Desc);
std::string SynthesizeBlockDescriptor(std::string DescTag,
std::string ImplTag,
int i, StringRef funcName,
unsigned hasCopy);
Stmt *SynthesizeBlockCall(CallExpr *Exp, const Expr* BlockExp);
void SynthesizeBlockLiterals(SourceLocation FunLocStart,
StringRef FunName);
FunctionDecl *SynthBlockInitFunctionDecl(StringRef name);
Stmt *SynthBlockInitExpr(BlockExpr *Exp,
const SmallVectorImpl<DeclRefExpr *> &InnerBlockDeclRefs);
// Misc. helper routines.
QualType getProtocolType();
void WarnAboutReturnGotoStmts(Stmt *S);
void HasReturnStmts(Stmt *S, bool &hasReturns);
void CheckFunctionPointerDecl(QualType dType, NamedDecl *ND);
void InsertBlockLiteralsWithinFunction(FunctionDecl *FD);
void InsertBlockLiteralsWithinMethod(ObjCMethodDecl *MD);
bool IsDeclStmtInForeachHeader(DeclStmt *DS);
void CollectBlockDeclRefInfo(BlockExpr *Exp);
void GetBlockDeclRefExprs(Stmt *S);
void GetInnerBlockDeclRefExprs(Stmt *S,
SmallVectorImpl<DeclRefExpr *> &InnerBlockDeclRefs,
llvm::SmallPtrSetImpl<const DeclContext *> &InnerContexts);
// We avoid calling Type::isBlockPointerType(), since it operates on the
// canonical type. We only care if the top-level type is a closure pointer.
bool isTopLevelBlockPointerType(QualType T) {
return isa<BlockPointerType>(T);
}
/// convertBlockPointerToFunctionPointer - Converts a block-pointer type
/// to a function pointer type and upon success, returns true; false
/// otherwise.
bool convertBlockPointerToFunctionPointer(QualType &T) {
if (isTopLevelBlockPointerType(T)) {
const BlockPointerType *BPT = T->getAs<BlockPointerType>();
T = Context->getPointerType(BPT->getPointeeType());
return true;
}
return false;
}
bool needToScanForQualifiers(QualType T);
QualType getSuperStructType();
QualType getConstantStringStructType();
QualType convertFunctionTypeOfBlocks(const FunctionType *FT);
bool BufferContainsPPDirectives(const char *startBuf, const char *endBuf);
void convertToUnqualifiedObjCType(QualType &T) {
if (T->isObjCQualifiedIdType())
T = Context->getObjCIdType();
else if (T->isObjCQualifiedClassType())
T = Context->getObjCClassType();
else if (T->isObjCObjectPointerType() &&
T->getPointeeType()->isObjCQualifiedInterfaceType()) {
if (const ObjCObjectPointerType * OBJPT =
T->getAsObjCInterfacePointerType()) {
const ObjCInterfaceType *IFaceT = OBJPT->getInterfaceType();
T = QualType(IFaceT, 0);
T = Context->getPointerType(T);
}
}
}
// FIXME: This predicate seems like it would be useful to add to ASTContext.
bool isObjCType(QualType T) {
if (!LangOpts.ObjC1 && !LangOpts.ObjC2)
return false;
QualType OCT = Context->getCanonicalType(T).getUnqualifiedType();
if (OCT == Context->getCanonicalType(Context->getObjCIdType()) ||
OCT == Context->getCanonicalType(Context->getObjCClassType()))
return true;
if (const PointerType *PT = OCT->getAs<PointerType>()) {
if (isa<ObjCInterfaceType>(PT->getPointeeType()) ||
PT->getPointeeType()->isObjCQualifiedIdType())
return true;
}
return false;
}
bool PointerTypeTakesAnyBlockArguments(QualType QT);
bool PointerTypeTakesAnyObjCQualifiedType(QualType QT);
void GetExtentOfArgList(const char *Name, const char *&LParen,
const char *&RParen);
void QuoteDoublequotes(std::string &From, std::string &To) {
for (unsigned i = 0; i < From.length(); i++) {
if (From[i] == '"')
To += "\\\"";
else
To += From[i];
}
}
QualType getSimpleFunctionType(QualType result,
ArrayRef<QualType> args,
bool variadic = false) {
if (result == Context->getObjCInstanceType())
result = Context->getObjCIdType();
FunctionProtoType::ExtProtoInfo fpi;
fpi.Variadic = variadic;
return Context->getFunctionType(result, args, fpi);
}
// Helper function: create a CStyleCastExpr with trivial type source info.
CStyleCastExpr* NoTypeInfoCStyleCastExpr(ASTContext *Ctx, QualType Ty,
CastKind Kind, Expr *E) {
TypeSourceInfo *TInfo = Ctx->getTrivialTypeSourceInfo(Ty, SourceLocation());
return CStyleCastExpr::Create(*Ctx, Ty, VK_RValue, Kind, E, nullptr,
TInfo, SourceLocation(), SourceLocation());
}
StringLiteral *getStringLiteral(StringRef Str) {
QualType StrType = Context->getConstantArrayType(
Context->CharTy, llvm::APInt(32, Str.size() + 1), ArrayType::Normal,
0);
return StringLiteral::Create(*Context, Str, StringLiteral::Ascii,
/*Pascal=*/false, StrType, SourceLocation());
}
};
class RewriteObjCFragileABI : public RewriteObjC {
public:
RewriteObjCFragileABI(std::string inFile, raw_ostream *OS,
DiagnosticsEngine &D, const LangOptions &LOpts,
bool silenceMacroWarn) : RewriteObjC(inFile, OS,
D, LOpts,
silenceMacroWarn) {}
~RewriteObjCFragileABI() override {}
void Initialize(ASTContext &context) override;
// Rewriting metadata
template<typename MethodIterator>
void RewriteObjCMethodsMetaData(MethodIterator MethodBegin,
MethodIterator MethodEnd,
bool IsInstanceMethod,
StringRef prefix,
StringRef ClassName,
std::string &Result);
void RewriteObjCProtocolMetaData(ObjCProtocolDecl *Protocol,
StringRef prefix, StringRef ClassName,
std::string &Result) override;
void RewriteObjCProtocolListMetaData(
const ObjCList<ObjCProtocolDecl> &Prots,
StringRef prefix, StringRef ClassName, std::string &Result) override;
void RewriteObjCClassMetaData(ObjCImplementationDecl *IDecl,
std::string &Result) override;
void RewriteMetaDataIntoBuffer(std::string &Result) override;
void RewriteObjCCategoryImplDecl(ObjCCategoryImplDecl *CDecl,
std::string &Result) override;
// Rewriting ivar
void RewriteIvarOffsetComputation(ObjCIvarDecl *ivar,
std::string &Result) override;
Stmt *RewriteObjCIvarRefExpr(ObjCIvarRefExpr *IV) override;
};
}
void RewriteObjC::RewriteBlocksInFunctionProtoType(QualType funcType,
NamedDecl *D) {
if (const FunctionProtoType *fproto
= dyn_cast<FunctionProtoType>(funcType.IgnoreParens())) {
for (const auto &I : fproto->param_types())
if (isTopLevelBlockPointerType(I)) {
// All the args are checked/rewritten. Don't call twice!
RewriteBlockPointerDecl(D);
break;
}
}
}
void RewriteObjC::CheckFunctionPointerDecl(QualType funcType, NamedDecl *ND) {
const PointerType *PT = funcType->getAs<PointerType>();
if (PT && PointerTypeTakesAnyBlockArguments(funcType))
RewriteBlocksInFunctionProtoType(PT->getPointeeType(), ND);
}
static bool IsHeaderFile(const std::string &Filename) {
std::string::size_type DotPos = Filename.rfind('.');
if (DotPos == std::string::npos) {
// no file extension
return false;
}
std::string Ext = std::string(Filename.begin()+DotPos+1, Filename.end());
// C header: .h
// C++ header: .hh or .H;
return Ext == "h" || Ext == "hh" || Ext == "H";
}
RewriteObjC::RewriteObjC(std::string inFile, raw_ostream* OS,
DiagnosticsEngine &D, const LangOptions &LOpts,
bool silenceMacroWarn)
: Diags(D), LangOpts(LOpts), InFileName(inFile), OutFile(OS),
SilenceRewriteMacroWarning(silenceMacroWarn) {
IsHeader = IsHeaderFile(inFile);
RewriteFailedDiag = Diags.getCustomDiagID(DiagnosticsEngine::Warning,
"rewriting sub-expression within a macro (may not be correct)");
TryFinallyContainsReturnDiag = Diags.getCustomDiagID(
DiagnosticsEngine::Warning,
"rewriter doesn't support user-specified control flow semantics "
"for @try/@finally (code may not execute properly)");
}
std::unique_ptr<ASTConsumer>
clang::CreateObjCRewriter(const std::string &InFile, raw_ostream *OS,
DiagnosticsEngine &Diags, const LangOptions &LOpts,
bool SilenceRewriteMacroWarning) {
return llvm::make_unique<RewriteObjCFragileABI>(InFile, OS, Diags, LOpts,
SilenceRewriteMacroWarning);
}
void RewriteObjC::InitializeCommon(ASTContext &context) {
Context = &context;
SM = &Context->getSourceManager();
TUDecl = Context->getTranslationUnitDecl();
MsgSendFunctionDecl = nullptr;
MsgSendSuperFunctionDecl = nullptr;
MsgSendStretFunctionDecl = nullptr;
MsgSendSuperStretFunctionDecl = nullptr;
MsgSendFpretFunctionDecl = nullptr;
GetClassFunctionDecl = nullptr;
GetMetaClassFunctionDecl = nullptr;
GetSuperClassFunctionDecl = nullptr;
SelGetUidFunctionDecl = nullptr;
CFStringFunctionDecl = nullptr;
ConstantStringClassReference = nullptr;
NSStringRecord = nullptr;
CurMethodDef = nullptr;
CurFunctionDef = nullptr;
CurFunctionDeclToDeclareForBlock = nullptr;
GlobalVarDecl = nullptr;
SuperStructDecl = nullptr;
ProtocolTypeDecl = nullptr;
ConstantStringDecl = nullptr;
BcLabelCount = 0;
SuperConstructorFunctionDecl = nullptr;
NumObjCStringLiterals = 0;
PropParentMap = nullptr;
CurrentBody = nullptr;
DisableReplaceStmt = false;
objc_impl_method = false;
// Get the ID and start/end of the main file.
MainFileID = SM->getMainFileID();
const llvm::MemoryBuffer *MainBuf = SM->getBuffer(MainFileID);
MainFileStart = MainBuf->getBufferStart();
MainFileEnd = MainBuf->getBufferEnd();
Rewrite.setSourceMgr(Context->getSourceManager(), Context->getLangOpts());
}
//===----------------------------------------------------------------------===//
// Top Level Driver Code
//===----------------------------------------------------------------------===//
void RewriteObjC::HandleTopLevelSingleDecl(Decl *D) {
if (Diags.hasErrorOccurred())
return;
// Two cases: either the decl could be in the main file, or it could be in a
// #included file. If the former, rewrite it now. If the later, check to see
// if we rewrote the #include/#import.
SourceLocation Loc = D->getLocation();
Loc = SM->getExpansionLoc(Loc);
// If this is for a builtin, ignore it.
if (Loc.isInvalid()) return;
// Look for built-in declarations that we need to refer during the rewrite.
if (FunctionDecl *FD = dyn_cast<FunctionDecl>(D)) {
RewriteFunctionDecl(FD);
} else if (VarDecl *FVD = dyn_cast<VarDecl>(D)) {
// declared in <Foundation/NSString.h>
if (FVD->getName() == "_NSConstantStringClassReference") {
ConstantStringClassReference = FVD;
return;
}
} else if (ObjCInterfaceDecl *ID = dyn_cast<ObjCInterfaceDecl>(D)) {
if (ID->isThisDeclarationADefinition())
RewriteInterfaceDecl(ID);
} else if (ObjCCategoryDecl *CD = dyn_cast<ObjCCategoryDecl>(D)) {
RewriteCategoryDecl(CD);
} else if (ObjCProtocolDecl *PD = dyn_cast<ObjCProtocolDecl>(D)) {
if (PD->isThisDeclarationADefinition())
RewriteProtocolDecl(PD);
} else if (LinkageSpecDecl *LSD = dyn_cast<LinkageSpecDecl>(D)) {
// Recurse into linkage specifications
for (DeclContext::decl_iterator DI = LSD->decls_begin(),
DIEnd = LSD->decls_end();
DI != DIEnd; ) {
if (ObjCInterfaceDecl *IFace = dyn_cast<ObjCInterfaceDecl>((*DI))) {
if (!IFace->isThisDeclarationADefinition()) {
SmallVector<Decl *, 8> DG;
SourceLocation StartLoc = IFace->getLocStart();
do {
if (isa<ObjCInterfaceDecl>(*DI) &&
!cast<ObjCInterfaceDecl>(*DI)->isThisDeclarationADefinition() &&
StartLoc == (*DI)->getLocStart())
DG.push_back(*DI);
else
break;
++DI;
} while (DI != DIEnd);
RewriteForwardClassDecl(DG);
continue;
}
}
if (ObjCProtocolDecl *Proto = dyn_cast<ObjCProtocolDecl>((*DI))) {
if (!Proto->isThisDeclarationADefinition()) {
SmallVector<Decl *, 8> DG;
SourceLocation StartLoc = Proto->getLocStart();
do {
if (isa<ObjCProtocolDecl>(*DI) &&
!cast<ObjCProtocolDecl>(*DI)->isThisDeclarationADefinition() &&
StartLoc == (*DI)->getLocStart())
DG.push_back(*DI);
else
break;
++DI;
} while (DI != DIEnd);
RewriteForwardProtocolDecl(DG);
continue;
}
}
HandleTopLevelSingleDecl(*DI);
++DI;
}
}
// If we have a decl in the main file, see if we should rewrite it.
if (SM->isWrittenInMainFile(Loc))
return HandleDeclInMainFile(D);
}
//===----------------------------------------------------------------------===//
// Syntactic (non-AST) Rewriting Code
//===----------------------------------------------------------------------===//
void RewriteObjC::RewriteInclude() {
SourceLocation LocStart = SM->getLocForStartOfFile(MainFileID);
StringRef MainBuf = SM->getBufferData(MainFileID);
const char *MainBufStart = MainBuf.begin();
const char *MainBufEnd = MainBuf.end();
size_t ImportLen = strlen("import");
// Loop over the whole file, looking for includes.
for (const char *BufPtr = MainBufStart; BufPtr < MainBufEnd; ++BufPtr) {
if (*BufPtr == '#') {
if (++BufPtr == MainBufEnd)
return;
while (*BufPtr == ' ' || *BufPtr == '\t')
if (++BufPtr == MainBufEnd)
return;
if (!strncmp(BufPtr, "import", ImportLen)) {
// replace import with include
SourceLocation ImportLoc =
LocStart.getLocWithOffset(BufPtr-MainBufStart);
ReplaceText(ImportLoc, ImportLen, "include");
BufPtr += ImportLen;
}
}
}
}
static std::string getIvarAccessString(ObjCIvarDecl *OID) {
const ObjCInterfaceDecl *ClassDecl = OID->getContainingInterface();
std::string S;
S = "((struct ";
S += ClassDecl->getIdentifier()->getName();
S += "_IMPL *)self)->";
S += OID->getName();
return S;
}
void RewriteObjC::RewritePropertyImplDecl(ObjCPropertyImplDecl *PID,
ObjCImplementationDecl *IMD,
ObjCCategoryImplDecl *CID) {
static bool objcGetPropertyDefined = false;
static bool objcSetPropertyDefined = false;
SourceLocation startLoc = PID->getLocStart();
InsertText(startLoc, "// ");
const char *startBuf = SM->getCharacterData(startLoc);
assert((*startBuf == '@') && "bogus @synthesize location");
const char *semiBuf = strchr(startBuf, ';');
assert((*semiBuf == ';') && "@synthesize: can't find ';'");
SourceLocation onePastSemiLoc =
startLoc.getLocWithOffset(semiBuf-startBuf+1);
if (PID->getPropertyImplementation() == ObjCPropertyImplDecl::Dynamic)
return; // FIXME: is this correct?
// Generate the 'getter' function.
ObjCPropertyDecl *PD = PID->getPropertyDecl();
ObjCIvarDecl *OID = PID->getPropertyIvarDecl();
if (!OID)
return;
unsigned Attributes = PD->getPropertyAttributes();
if (!PD->getGetterMethodDecl()->isDefined()) {
bool GenGetProperty = !(Attributes & ObjCPropertyDecl::OBJC_PR_nonatomic) &&
(Attributes & (ObjCPropertyDecl::OBJC_PR_retain |
ObjCPropertyDecl::OBJC_PR_copy));
std::string Getr;
if (GenGetProperty && !objcGetPropertyDefined) {
objcGetPropertyDefined = true;
// FIXME. Is this attribute correct in all cases?
Getr = "\nextern \"C\" __declspec(dllimport) "
"id objc_getProperty(id, SEL, long, bool);\n";
}
RewriteObjCMethodDecl(OID->getContainingInterface(),
PD->getGetterMethodDecl(), Getr);
Getr += "{ ";
// Synthesize an explicit cast to gain access to the ivar.
// See objc-act.c:objc_synthesize_new_getter() for details.
if (GenGetProperty) {
// return objc_getProperty(self, _cmd, offsetof(ClassDecl, OID), 1)
Getr += "typedef ";
const FunctionType *FPRetType = nullptr;
RewriteTypeIntoString(PD->getGetterMethodDecl()->getReturnType(), Getr,
FPRetType);
Getr += " _TYPE";
if (FPRetType) {
Getr += ")"; // close the precedence "scope" for "*".
// Now, emit the argument types (if any).
if (const FunctionProtoType *FT = dyn_cast<FunctionProtoType>(FPRetType)){
Getr += "(";
for (unsigned i = 0, e = FT->getNumParams(); i != e; ++i) {
if (i) Getr += ", ";
std::string ParamStr =
FT->getParamType(i).getAsString(Context->getPrintingPolicy());
Getr += ParamStr;
}
if (FT->isVariadic()) {
if (FT->getNumParams())
Getr += ", ";
Getr += "...";
}
Getr += ")";
} else
Getr += "()";
}
Getr += ";\n";
Getr += "return (_TYPE)";
Getr += "objc_getProperty(self, _cmd, ";
RewriteIvarOffsetComputation(OID, Getr);
Getr += ", 1)";
}
else
Getr += "return " + getIvarAccessString(OID);
Getr += "; }";
InsertText(onePastSemiLoc, Getr);
}
if (PD->isReadOnly() || PD->getSetterMethodDecl()->isDefined())
return;
// Generate the 'setter' function.
std::string Setr;
bool GenSetProperty = Attributes & (ObjCPropertyDecl::OBJC_PR_retain |
ObjCPropertyDecl::OBJC_PR_copy);
if (GenSetProperty && !objcSetPropertyDefined) {
objcSetPropertyDefined = true;
// FIXME. Is this attribute correct in all cases?
Setr = "\nextern \"C\" __declspec(dllimport) "
"void objc_setProperty (id, SEL, long, id, bool, bool);\n";
}
RewriteObjCMethodDecl(OID->getContainingInterface(),
PD->getSetterMethodDecl(), Setr);
Setr += "{ ";
// Synthesize an explicit cast to initialize the ivar.
// See objc-act.c:objc_synthesize_new_setter() for details.
if (GenSetProperty) {
Setr += "objc_setProperty (self, _cmd, ";
RewriteIvarOffsetComputation(OID, Setr);
Setr += ", (id)";
Setr += PD->getName();
Setr += ", ";
if (Attributes & ObjCPropertyDecl::OBJC_PR_nonatomic)
Setr += "0, ";
else
Setr += "1, ";
if (Attributes & ObjCPropertyDecl::OBJC_PR_copy)
Setr += "1)";
else
Setr += "0)";
}
else {
Setr += getIvarAccessString(OID) + " = ";
Setr += PD->getName();
}
Setr += "; }";
InsertText(onePastSemiLoc, Setr);
}
static void RewriteOneForwardClassDecl(ObjCInterfaceDecl *ForwardDecl,
std::string &typedefString) {
typedefString += "#ifndef _REWRITER_typedef_";
typedefString += ForwardDecl->getNameAsString();
typedefString += "\n";
typedefString += "#define _REWRITER_typedef_";
typedefString += ForwardDecl->getNameAsString();
typedefString += "\n";
typedefString += "typedef struct objc_object ";
typedefString += ForwardDecl->getNameAsString();
typedefString += ";\n#endif\n";
}
void RewriteObjC::RewriteForwardClassEpilogue(ObjCInterfaceDecl *ClassDecl,
const std::string &typedefString) {
SourceLocation startLoc = ClassDecl->getLocStart();
const char *startBuf = SM->getCharacterData(startLoc);
const char *semiPtr = strchr(startBuf, ';');
// Replace the @class with typedefs corresponding to the classes.
ReplaceText(startLoc, semiPtr-startBuf+1, typedefString);
}
void RewriteObjC::RewriteForwardClassDecl(DeclGroupRef D) {
std::string typedefString;
for (DeclGroupRef::iterator I = D.begin(), E = D.end(); I != E; ++I) {
ObjCInterfaceDecl *ForwardDecl = cast<ObjCInterfaceDecl>(*I);
if (I == D.begin()) {
// Translate to typedef's that forward reference structs with the same name
// as the class. As a convenience, we include the original declaration
// as a comment.
typedefString += "// @class ";
typedefString += ForwardDecl->getNameAsString();
typedefString += ";\n";
}
RewriteOneForwardClassDecl(ForwardDecl, typedefString);
}
DeclGroupRef::iterator I = D.begin();
RewriteForwardClassEpilogue(cast<ObjCInterfaceDecl>(*I), typedefString);
}
void RewriteObjC::RewriteForwardClassDecl(const SmallVectorImpl<Decl *> &D) {
std::string typedefString;
for (unsigned i = 0; i < D.size(); i++) {
ObjCInterfaceDecl *ForwardDecl = cast<ObjCInterfaceDecl>(D[i]);
if (i == 0) {
typedefString += "// @class ";
typedefString += ForwardDecl->getNameAsString();
typedefString += ";\n";
}
RewriteOneForwardClassDecl(ForwardDecl, typedefString);
}
RewriteForwardClassEpilogue(cast<ObjCInterfaceDecl>(D[0]), typedefString);
}
void RewriteObjC::RewriteMethodDeclaration(ObjCMethodDecl *Method) {
// When method is a synthesized one, such as a getter/setter there is
// nothing to rewrite.
if (Method->isImplicit())
return;
SourceLocation LocStart = Method->getLocStart();
SourceLocation LocEnd = Method->getLocEnd();
if (SM->getExpansionLineNumber(LocEnd) >
SM->getExpansionLineNumber(LocStart)) {
InsertText(LocStart, "#if 0\n");
ReplaceText(LocEnd, 1, ";\n#endif\n");
} else {
InsertText(LocStart, "// ");
}
}
void RewriteObjC::RewriteProperty(ObjCPropertyDecl *prop) {
SourceLocation Loc = prop->getAtLoc();
ReplaceText(Loc, 0, "// ");
// FIXME: handle properties that are declared across multiple lines.
}
void RewriteObjC::RewriteCategoryDecl(ObjCCategoryDecl *CatDecl) {
SourceLocation LocStart = CatDecl->getLocStart();
// FIXME: handle category headers that are declared across multiple lines.
ReplaceText(LocStart, 0, "// ");
for (auto *I : CatDecl->properties())
RewriteProperty(I);
for (auto *I : CatDecl->instance_methods())
RewriteMethodDeclaration(I);
for (auto *I : CatDecl->class_methods())
RewriteMethodDeclaration(I);
// Lastly, comment out the @end.
ReplaceText(CatDecl->getAtEndRange().getBegin(),
strlen("@end"), "/* @end */");
}
void RewriteObjC::RewriteProtocolDecl(ObjCProtocolDecl *PDecl) {
SourceLocation LocStart = PDecl->getLocStart();
assert(PDecl->isThisDeclarationADefinition());
// FIXME: handle protocol headers that are declared across multiple lines.
ReplaceText(LocStart, 0, "// ");
for (auto *I : PDecl->instance_methods())
RewriteMethodDeclaration(I);
for (auto *I : PDecl->class_methods())
RewriteMethodDeclaration(I);
for (auto *I : PDecl->properties())
RewriteProperty(I);
// Lastly, comment out the @end.
SourceLocation LocEnd = PDecl->getAtEndRange().getBegin();
ReplaceText(LocEnd, strlen("@end"), "/* @end */");
// Must comment out @optional/@required
const char *startBuf = SM->getCharacterData(LocStart);
const char *endBuf = SM->getCharacterData(LocEnd);
for (const char *p = startBuf; p < endBuf; p++) {
if (*p == '@' && !strncmp(p+1, "optional", strlen("optional"))) {
SourceLocation OptionalLoc = LocStart.getLocWithOffset(p-startBuf);
ReplaceText(OptionalLoc, strlen("@optional"), "/* @optional */");
}
else if (*p == '@' && !strncmp(p+1, "required", strlen("required"))) {
SourceLocation OptionalLoc = LocStart.getLocWithOffset(p-startBuf);
ReplaceText(OptionalLoc, strlen("@required"), "/* @required */");
}
}
}
void RewriteObjC::RewriteForwardProtocolDecl(DeclGroupRef D) {
SourceLocation LocStart = (*D.begin())->getLocStart();
if (LocStart.isInvalid())
llvm_unreachable("Invalid SourceLocation");
// FIXME: handle forward protocol that are declared across multiple lines.
ReplaceText(LocStart, 0, "// ");
}
void
RewriteObjC::RewriteForwardProtocolDecl(const SmallVectorImpl<Decl *> &DG) {
SourceLocation LocStart = DG[0]->getLocStart();
if (LocStart.isInvalid())
llvm_unreachable("Invalid SourceLocation");
// FIXME: handle forward protocol that are declared across multiple lines.
ReplaceText(LocStart, 0, "// ");
}
void RewriteObjC::RewriteTypeIntoString(QualType T, std::string &ResultStr,
const FunctionType *&FPRetType) {
if (T->isObjCQualifiedIdType())
ResultStr += "id";
else if (T->isFunctionPointerType() ||
T->isBlockPointerType()) {
// needs special handling, since pointer-to-functions have special
// syntax (where a decaration models use).
QualType retType = T;
QualType PointeeTy;
if (const PointerType* PT = retType->getAs<PointerType>())
PointeeTy = PT->getPointeeType();
else if (const BlockPointerType *BPT = retType->getAs<BlockPointerType>())
PointeeTy = BPT->getPointeeType();
if ((FPRetType = PointeeTy->getAs<FunctionType>())) {
ResultStr +=
FPRetType->getReturnType().getAsString(Context->getPrintingPolicy());
ResultStr += "(*";
}
} else
ResultStr += T.getAsString(Context->getPrintingPolicy());
}
void RewriteObjC::RewriteObjCMethodDecl(const ObjCInterfaceDecl *IDecl,
ObjCMethodDecl *OMD,
std::string &ResultStr) {
//fprintf(stderr,"In RewriteObjCMethodDecl\n");
const FunctionType *FPRetType = nullptr;
ResultStr += "\nstatic ";
RewriteTypeIntoString(OMD->getReturnType(), ResultStr, FPRetType);
ResultStr += " ";
// Unique method name
std::string NameStr;
if (OMD->isInstanceMethod())
NameStr += "_I_";
else
NameStr += "_C_";
NameStr += IDecl->getNameAsString();
NameStr += "_";
if (ObjCCategoryImplDecl *CID =
dyn_cast<ObjCCategoryImplDecl>(OMD->getDeclContext())) {
NameStr += CID->getNameAsString();
NameStr += "_";
}
// Append selector names, replacing ':' with '_'
{
std::string selString = OMD->getSelector().getAsString();
int len = selString.size();
for (int i = 0; i < len; i++)
if (selString[i] == ':')
selString[i] = '_';
NameStr += selString;
}
// Remember this name for metadata emission
MethodInternalNames[OMD] = NameStr;
ResultStr += NameStr;
// Rewrite arguments
ResultStr += "(";
// invisible arguments
if (OMD->isInstanceMethod()) {
QualType selfTy = Context->getObjCInterfaceType(IDecl);
selfTy = Context->getPointerType(selfTy);
if (!LangOpts.MicrosoftExt) {
if (ObjCSynthesizedStructs.count(const_cast<ObjCInterfaceDecl*>(IDecl)))
ResultStr += "struct ";
}
// When rewriting for Microsoft, explicitly omit the structure name.
ResultStr += IDecl->getNameAsString();
ResultStr += " *";
}
else
ResultStr += Context->getObjCClassType().getAsString(
Context->getPrintingPolicy());
ResultStr += " self, ";
ResultStr += Context->getObjCSelType().getAsString(Context->getPrintingPolicy());
ResultStr += " _cmd";
// Method arguments.
for (const auto *PDecl : OMD->params()) {
ResultStr += ", ";
if (PDecl->getType()->isObjCQualifiedIdType()) {
ResultStr += "id ";
ResultStr += PDecl->getNameAsString();
} else {
std::string Name = PDecl->getNameAsString();
QualType QT = PDecl->getType();
// Make sure we convert "t (^)(...)" to "t (*)(...)".
(void)convertBlockPointerToFunctionPointer(QT);
QT.getAsStringInternal(Name, Context->getPrintingPolicy());
ResultStr += Name;
}
}
if (OMD->isVariadic())
ResultStr += ", ...";
ResultStr += ") ";
if (FPRetType) {
ResultStr += ")"; // close the precedence "scope" for "*".
// Now, emit the argument types (if any).
if (const FunctionProtoType *FT = dyn_cast<FunctionProtoType>(FPRetType)) {
ResultStr += "(";
for (unsigned i = 0, e = FT->getNumParams(); i != e; ++i) {
if (i) ResultStr += ", ";
std::string ParamStr =
FT->getParamType(i).getAsString(Context->getPrintingPolicy());
ResultStr += ParamStr;
}
if (FT->isVariadic()) {
if (FT->getNumParams())
ResultStr += ", ";
ResultStr += "...";
}
ResultStr += ")";
} else {
ResultStr += "()";
}
}
}
void RewriteObjC::RewriteImplementationDecl(Decl *OID) {
ObjCImplementationDecl *IMD = dyn_cast<ObjCImplementationDecl>(OID);
ObjCCategoryImplDecl *CID = dyn_cast<ObjCCategoryImplDecl>(OID);
InsertText(IMD ? IMD->getLocStart() : CID->getLocStart(), "// ");
for (auto *OMD : IMD ? IMD->instance_methods() : CID->instance_methods()) {
std::string ResultStr;
RewriteObjCMethodDecl(OMD->getClassInterface(), OMD, ResultStr);
SourceLocation LocStart = OMD->getLocStart();
SourceLocation LocEnd = OMD->getCompoundBody()->getLocStart();
const char *startBuf = SM->getCharacterData(LocStart);
const char *endBuf = SM->getCharacterData(LocEnd);
ReplaceText(LocStart, endBuf-startBuf, ResultStr);
}
for (auto *OMD : IMD ? IMD->class_methods() : CID->class_methods()) {
std::string ResultStr;
RewriteObjCMethodDecl(OMD->getClassInterface(), OMD, ResultStr);
SourceLocation LocStart = OMD->getLocStart();
SourceLocation LocEnd = OMD->getCompoundBody()->getLocStart();
const char *startBuf = SM->getCharacterData(LocStart);
const char *endBuf = SM->getCharacterData(LocEnd);
ReplaceText(LocStart, endBuf-startBuf, ResultStr);
}
for (auto *I : IMD ? IMD->property_impls() : CID->property_impls())
RewritePropertyImplDecl(I, IMD, CID);
InsertText(IMD ? IMD->getLocEnd() : CID->getLocEnd(), "// ");
}
void RewriteObjC::RewriteInterfaceDecl(ObjCInterfaceDecl *ClassDecl) {
std::string ResultStr;
if (!ObjCForwardDecls.count(ClassDecl->getCanonicalDecl())) {
// we haven't seen a forward decl - generate a typedef.
ResultStr = "#ifndef _REWRITER_typedef_";
ResultStr += ClassDecl->getNameAsString();
ResultStr += "\n";
ResultStr += "#define _REWRITER_typedef_";
ResultStr += ClassDecl->getNameAsString();
ResultStr += "\n";
ResultStr += "typedef struct objc_object ";
ResultStr += ClassDecl->getNameAsString();
ResultStr += ";\n#endif\n";
// Mark this typedef as having been generated.
ObjCForwardDecls.insert(ClassDecl->getCanonicalDecl());
}
RewriteObjCInternalStruct(ClassDecl, ResultStr);
for (auto *I : ClassDecl->properties())
RewriteProperty(I);
for (auto *I : ClassDecl->instance_methods())
RewriteMethodDeclaration(I);
for (auto *I : ClassDecl->class_methods())
RewriteMethodDeclaration(I);
// Lastly, comment out the @end.
ReplaceText(ClassDecl->getAtEndRange().getBegin(), strlen("@end"),
"/* @end */");
}
Stmt *RewriteObjC::RewritePropertyOrImplicitSetter(PseudoObjectExpr *PseudoOp) {
SourceRange OldRange = PseudoOp->getSourceRange();
// We just magically know some things about the structure of this
// expression.
ObjCMessageExpr *OldMsg =
cast<ObjCMessageExpr>(PseudoOp->getSemanticExpr(
PseudoOp->getNumSemanticExprs() - 1));
// Because the rewriter doesn't allow us to rewrite rewritten code,
// we need to suppress rewriting the sub-statements.
Expr *Base, *RHS;
{
DisableReplaceStmtScope S(*this);
// Rebuild the base expression if we have one.
Base = nullptr;
if (OldMsg->getReceiverKind() == ObjCMessageExpr::Instance) {
Base = OldMsg->getInstanceReceiver();
Base = cast<OpaqueValueExpr>(Base)->getSourceExpr();
Base = cast<Expr>(RewriteFunctionBodyOrGlobalInitializer(Base));
}
// Rebuild the RHS.
RHS = cast<BinaryOperator>(PseudoOp->getSyntacticForm())->getRHS();
RHS = cast<OpaqueValueExpr>(RHS)->getSourceExpr();
RHS = cast<Expr>(RewriteFunctionBodyOrGlobalInitializer(RHS));
}
// TODO: avoid this copy.
SmallVector<SourceLocation, 1> SelLocs;
OldMsg->getSelectorLocs(SelLocs);
ObjCMessageExpr *NewMsg = nullptr;
switch (OldMsg->getReceiverKind()) {
case ObjCMessageExpr::Class:
NewMsg = ObjCMessageExpr::Create(*Context, OldMsg->getType(),
OldMsg->getValueKind(),
OldMsg->getLeftLoc(),
OldMsg->getClassReceiverTypeInfo(),
OldMsg->getSelector(),
SelLocs,
OldMsg->getMethodDecl(),
RHS,
OldMsg->getRightLoc(),
OldMsg->isImplicit());
break;
case ObjCMessageExpr::Instance:
NewMsg = ObjCMessageExpr::Create(*Context, OldMsg->getType(),
OldMsg->getValueKind(),
OldMsg->getLeftLoc(),
Base,
OldMsg->getSelector(),
SelLocs,
OldMsg->getMethodDecl(),
RHS,
OldMsg->getRightLoc(),
OldMsg->isImplicit());
break;
case ObjCMessageExpr::SuperClass:
case ObjCMessageExpr::SuperInstance:
NewMsg = ObjCMessageExpr::Create(*Context, OldMsg->getType(),
OldMsg->getValueKind(),
OldMsg->getLeftLoc(),
OldMsg->getSuperLoc(),
OldMsg->getReceiverKind() == ObjCMessageExpr::SuperInstance,
OldMsg->getSuperType(),
OldMsg->getSelector(),
SelLocs,
OldMsg->getMethodDecl(),
RHS,
OldMsg->getRightLoc(),
OldMsg->isImplicit());
break;
}
Stmt *Replacement = SynthMessageExpr(NewMsg);
ReplaceStmtWithRange(PseudoOp, Replacement, OldRange);
return Replacement;
}
Stmt *RewriteObjC::RewritePropertyOrImplicitGetter(PseudoObjectExpr *PseudoOp) {
SourceRange OldRange = PseudoOp->getSourceRange();
// We just magically know some things about the structure of this
// expression.
ObjCMessageExpr *OldMsg =
cast<ObjCMessageExpr>(PseudoOp->getResultExpr()->IgnoreImplicit());
// Because the rewriter doesn't allow us to rewrite rewritten code,
// we need to suppress rewriting the sub-statements.
Expr *Base = nullptr;
{
DisableReplaceStmtScope S(*this);
// Rebuild the base expression if we have one.
if (OldMsg->getReceiverKind() == ObjCMessageExpr::Instance) {
Base = OldMsg->getInstanceReceiver();
Base = cast<OpaqueValueExpr>(Base)->getSourceExpr();
Base = cast<Expr>(RewriteFunctionBodyOrGlobalInitializer(Base));
}
}
// Intentionally empty.
SmallVector<SourceLocation, 1> SelLocs;
SmallVector<Expr*, 1> Args;
ObjCMessageExpr *NewMsg = nullptr;
switch (OldMsg->getReceiverKind()) {
case ObjCMessageExpr::Class:
NewMsg = ObjCMessageExpr::Create(*Context, OldMsg->getType(),
OldMsg->getValueKind(),
OldMsg->getLeftLoc(),
OldMsg->getClassReceiverTypeInfo(),
OldMsg->getSelector(),
SelLocs,
OldMsg->getMethodDecl(),
Args,
OldMsg->getRightLoc(),
OldMsg->isImplicit());
break;
case ObjCMessageExpr::Instance:
NewMsg = ObjCMessageExpr::Create(*Context, OldMsg->getType(),
OldMsg->getValueKind(),
OldMsg->getLeftLoc(),
Base,
OldMsg->getSelector(),
SelLocs,
OldMsg->getMethodDecl(),
Args,
OldMsg->getRightLoc(),
OldMsg->isImplicit());
break;
case ObjCMessageExpr::SuperClass:
case ObjCMessageExpr::SuperInstance:
NewMsg = ObjCMessageExpr::Create(*Context, OldMsg->getType(),
OldMsg->getValueKind(),
OldMsg->getLeftLoc(),
OldMsg->getSuperLoc(),
OldMsg->getReceiverKind() == ObjCMessageExpr::SuperInstance,
OldMsg->getSuperType(),
OldMsg->getSelector(),
SelLocs,
OldMsg->getMethodDecl(),
Args,
OldMsg->getRightLoc(),
OldMsg->isImplicit());
break;
}
Stmt *Replacement = SynthMessageExpr(NewMsg);
ReplaceStmtWithRange(PseudoOp, Replacement, OldRange);
return Replacement;
}
/// SynthCountByEnumWithState - To print:
/// ((unsigned int (*)
/// (id, SEL, struct __objcFastEnumerationState *, id *, unsigned int))
/// (void *)objc_msgSend)((id)l_collection,
/// sel_registerName(
/// "countByEnumeratingWithState:objects:count:"),
/// &enumState,
/// (id *)__rw_items, (unsigned int)16)
///
void RewriteObjC::SynthCountByEnumWithState(std::string &buf) {
buf += "((unsigned int (*) (id, SEL, struct __objcFastEnumerationState *, "
"id *, unsigned int))(void *)objc_msgSend)";
buf += "\n\t\t";
buf += "((id)l_collection,\n\t\t";
buf += "sel_registerName(\"countByEnumeratingWithState:objects:count:\"),";
buf += "\n\t\t";
buf += "&enumState, "
"(id *)__rw_items, (unsigned int)16)";
}
/// RewriteBreakStmt - Rewrite for a break-stmt inside an ObjC2's foreach
/// statement to exit to its outer synthesized loop.
///
Stmt *RewriteObjC::RewriteBreakStmt(BreakStmt *S) {
if (Stmts.empty() || !isa<ObjCForCollectionStmt>(Stmts.back()))
return S;
// replace break with goto __break_label
std::string buf;
SourceLocation startLoc = S->getLocStart();
buf = "goto __break_label_";
buf += utostr(ObjCBcLabelNo.back());
ReplaceText(startLoc, strlen("break"), buf);
return nullptr;
}
/// RewriteContinueStmt - Rewrite for a continue-stmt inside an ObjC2's foreach
/// statement to continue with its inner synthesized loop.
///
Stmt *RewriteObjC::RewriteContinueStmt(ContinueStmt *S) {
if (Stmts.empty() || !isa<ObjCForCollectionStmt>(Stmts.back()))
return S;
// replace continue with goto __continue_label
std::string buf;
SourceLocation startLoc = S->getLocStart();
buf = "goto __continue_label_";
buf += utostr(ObjCBcLabelNo.back());
ReplaceText(startLoc, strlen("continue"), buf);
return nullptr;
}
/// RewriteObjCForCollectionStmt - Rewriter for ObjC2's foreach statement.
/// It rewrites:
/// for ( type elem in collection) { stmts; }
/// Into:
/// {
/// type elem;
/// struct __objcFastEnumerationState enumState = { 0 };
/// id __rw_items[16];
/// id l_collection = (id)collection;
/// unsigned long limit = [l_collection countByEnumeratingWithState:&enumState
/// objects:__rw_items count:16];
/// if (limit) {
/// unsigned long startMutations = *enumState.mutationsPtr;
/// do {
/// unsigned long counter = 0;
/// do {
/// if (startMutations != *enumState.mutationsPtr)
/// objc_enumerationMutation(l_collection);
/// elem = (type)enumState.itemsPtr[counter++];
/// stmts;
/// __continue_label: ;
/// } while (counter < limit);
/// } while (limit = [l_collection countByEnumeratingWithState:&enumState
/// objects:__rw_items count:16]);
/// elem = nil;
/// __break_label: ;
/// }
/// else
/// elem = nil;
/// }
///
Stmt *RewriteObjC::RewriteObjCForCollectionStmt(ObjCForCollectionStmt *S,
SourceLocation OrigEnd) {
assert(!Stmts.empty() && "ObjCForCollectionStmt - Statement stack empty");
assert(isa<ObjCForCollectionStmt>(Stmts.back()) &&
"ObjCForCollectionStmt Statement stack mismatch");
assert(!ObjCBcLabelNo.empty() &&
"ObjCForCollectionStmt - Label No stack empty");
SourceLocation startLoc = S->getLocStart();
const char *startBuf = SM->getCharacterData(startLoc);
StringRef elementName;
std::string elementTypeAsString;
std::string buf;
buf = "\n{\n\t";
if (DeclStmt *DS = dyn_cast<DeclStmt>(S->getElement())) {
// type elem;
NamedDecl* D = cast<NamedDecl>(DS->getSingleDecl());
QualType ElementType = cast<ValueDecl>(D)->getType();
if (ElementType->isObjCQualifiedIdType() ||
ElementType->isObjCQualifiedInterfaceType())
// Simply use 'id' for all qualified types.
elementTypeAsString = "id";
else
elementTypeAsString = ElementType.getAsString(Context->getPrintingPolicy());
buf += elementTypeAsString;
buf += " ";
elementName = D->getName();
buf += elementName;
buf += ";\n\t";
}
else {
DeclRefExpr *DR = cast<DeclRefExpr>(S->getElement());
elementName = DR->getDecl()->getName();
ValueDecl *VD = cast<ValueDecl>(DR->getDecl());
if (VD->getType()->isObjCQualifiedIdType() ||
VD->getType()->isObjCQualifiedInterfaceType())
// Simply use 'id' for all qualified types.
elementTypeAsString = "id";
else
elementTypeAsString = VD->getType().getAsString(Context->getPrintingPolicy());
}
// struct __objcFastEnumerationState enumState = { 0 };
buf += "struct __objcFastEnumerationState enumState = { 0 };\n\t";
// id __rw_items[16];
buf += "id __rw_items[16];\n\t";
// id l_collection = (id)
buf += "id l_collection = (id)";
// Find start location of 'collection' the hard way!
const char *startCollectionBuf = startBuf;
startCollectionBuf += 3; // skip 'for'
startCollectionBuf = strchr(startCollectionBuf, '(');
startCollectionBuf++; // skip '('
// find 'in' and skip it.
while (*startCollectionBuf != ' ' ||
*(startCollectionBuf+1) != 'i' || *(startCollectionBuf+2) != 'n' ||
(*(startCollectionBuf+3) != ' ' &&
*(startCollectionBuf+3) != '[' && *(startCollectionBuf+3) != '('))
startCollectionBuf++;
startCollectionBuf += 3;
// Replace: "for (type element in" with string constructed thus far.
ReplaceText(startLoc, startCollectionBuf - startBuf, buf);
// Replace ')' in for '(' type elem in collection ')' with ';'
SourceLocation rightParenLoc = S->getRParenLoc();
const char *rparenBuf = SM->getCharacterData(rightParenLoc);
SourceLocation lparenLoc = startLoc.getLocWithOffset(rparenBuf-startBuf);
buf = ";\n\t";
// unsigned long limit = [l_collection countByEnumeratingWithState:&enumState
// objects:__rw_items count:16];
// which is synthesized into:
// unsigned int limit =
// ((unsigned int (*)
// (id, SEL, struct __objcFastEnumerationState *, id *, unsigned int))
// (void *)objc_msgSend)((id)l_collection,
// sel_registerName(
// "countByEnumeratingWithState:objects:count:"),
// (struct __objcFastEnumerationState *)&state,
// (id *)__rw_items, (unsigned int)16);
buf += "unsigned long limit =\n\t\t";
SynthCountByEnumWithState(buf);
buf += ";\n\t";
/// if (limit) {
/// unsigned long startMutations = *enumState.mutationsPtr;
/// do {
/// unsigned long counter = 0;
/// do {
/// if (startMutations != *enumState.mutationsPtr)
/// objc_enumerationMutation(l_collection);
/// elem = (type)enumState.itemsPtr[counter++];
buf += "if (limit) {\n\t";
buf += "unsigned long startMutations = *enumState.mutationsPtr;\n\t";
buf += "do {\n\t\t";
buf += "unsigned long counter = 0;\n\t\t";
buf += "do {\n\t\t\t";
buf += "if (startMutations != *enumState.mutationsPtr)\n\t\t\t\t";
buf += "objc_enumerationMutation(l_collection);\n\t\t\t";
buf += elementName;
buf += " = (";
buf += elementTypeAsString;
buf += ")enumState.itemsPtr[counter++];";
// Replace ')' in for '(' type elem in collection ')' with all of these.
ReplaceText(lparenLoc, 1, buf);
/// __continue_label: ;
/// } while (counter < limit);
/// } while (limit = [l_collection countByEnumeratingWithState:&enumState
/// objects:__rw_items count:16]);
/// elem = nil;
/// __break_label: ;
/// }
/// else
/// elem = nil;
/// }
///
buf = ";\n\t";
buf += "__continue_label_";
buf += utostr(ObjCBcLabelNo.back());
buf += ": ;";
buf += "\n\t\t";
buf += "} while (counter < limit);\n\t";
buf += "} while (limit = ";
SynthCountByEnumWithState(buf);
buf += ");\n\t";
buf += elementName;
buf += " = ((";
buf += elementTypeAsString;
buf += ")0);\n\t";
buf += "__break_label_";
buf += utostr(ObjCBcLabelNo.back());
buf += ": ;\n\t";
buf += "}\n\t";
buf += "else\n\t\t";
buf += elementName;
buf += " = ((";
buf += elementTypeAsString;
buf += ")0);\n\t";
buf += "}\n";
// Insert all these *after* the statement body.
// FIXME: If this should support Obj-C++, support CXXTryStmt
if (isa<CompoundStmt>(S->getBody())) {
SourceLocation endBodyLoc = OrigEnd.getLocWithOffset(1);
InsertText(endBodyLoc, buf);
} else {
/* Need to treat single statements specially. For example:
*
* for (A *a in b) if (stuff()) break;
* for (A *a in b) xxxyy;
*
* The following code simply scans ahead to the semi to find the actual end.
*/
const char *stmtBuf = SM->getCharacterData(OrigEnd);
const char *semiBuf = strchr(stmtBuf, ';');
assert(semiBuf && "Can't find ';'");
SourceLocation endBodyLoc = OrigEnd.getLocWithOffset(semiBuf-stmtBuf+1);
InsertText(endBodyLoc, buf);
}
Stmts.pop_back();
ObjCBcLabelNo.pop_back();
return nullptr;
}
/// RewriteObjCSynchronizedStmt -
/// This routine rewrites @synchronized(expr) stmt;
/// into:
/// objc_sync_enter(expr);
/// @try stmt @finally { objc_sync_exit(expr); }
///
Stmt *RewriteObjC::RewriteObjCSynchronizedStmt(ObjCAtSynchronizedStmt *S) {
// Get the start location and compute the semi location.
SourceLocation startLoc = S->getLocStart();
const char *startBuf = SM->getCharacterData(startLoc);
assert((*startBuf == '@') && "bogus @synchronized location");
std::string buf;
buf = "objc_sync_enter((id)";
const char *lparenBuf = startBuf;
while (*lparenBuf != '(') lparenBuf++;
ReplaceText(startLoc, lparenBuf-startBuf+1, buf);
// We can't use S->getSynchExpr()->getLocEnd() to find the end location, since
// the sync expression is typically a message expression that's already
// been rewritten! (which implies the SourceLocation's are invalid).
SourceLocation endLoc = S->getSynchBody()->getLocStart();
const char *endBuf = SM->getCharacterData(endLoc);
while (*endBuf != ')') endBuf--;
SourceLocation rparenLoc = startLoc.getLocWithOffset(endBuf-startBuf);
buf = ");\n";
// declare a new scope with two variables, _stack and _rethrow.
buf += "/* @try scope begin */ \n{ struct _objc_exception_data {\n";
buf += "int buf[18/*32-bit i386*/];\n";
buf += "char *pointers[4];} _stack;\n";
buf += "id volatile _rethrow = 0;\n";
buf += "objc_exception_try_enter(&_stack);\n";
buf += "if (!_setjmp(_stack.buf)) /* @try block continue */\n";
ReplaceText(rparenLoc, 1, buf);
startLoc = S->getSynchBody()->getLocEnd();
startBuf = SM->getCharacterData(startLoc);
assert((*startBuf == '}') && "bogus @synchronized block");
SourceLocation lastCurlyLoc = startLoc;
buf = "}\nelse {\n";
buf += " _rethrow = objc_exception_extract(&_stack);\n";
buf += "}\n";
buf += "{ /* implicit finally clause */\n";
buf += " if (!_rethrow) objc_exception_try_exit(&_stack);\n";
std::string syncBuf;
syncBuf += " objc_sync_exit(";
Expr *syncExpr = S->getSynchExpr();
CastKind CK = syncExpr->getType()->isObjCObjectPointerType()
? CK_BitCast :
syncExpr->getType()->isBlockPointerType()
? CK_BlockPointerToObjCPointerCast
: CK_CPointerToObjCPointerCast;
syncExpr = NoTypeInfoCStyleCastExpr(Context, Context->getObjCIdType(),
CK, syncExpr);
std::string syncExprBufS;
llvm::raw_string_ostream syncExprBuf(syncExprBufS);
assert(syncExpr != nullptr && "Expected non-null Expr");
syncExpr->printPretty(syncExprBuf, nullptr, PrintingPolicy(LangOpts));
syncBuf += syncExprBuf.str();
syncBuf += ");";
buf += syncBuf;
buf += "\n if (_rethrow) objc_exception_throw(_rethrow);\n";
buf += "}\n";
buf += "}";
ReplaceText(lastCurlyLoc, 1, buf);
bool hasReturns = false;
HasReturnStmts(S->getSynchBody(), hasReturns);
if (hasReturns)
RewriteSyncReturnStmts(S->getSynchBody(), syncBuf);
return nullptr;
}
void RewriteObjC::WarnAboutReturnGotoStmts(Stmt *S)
{
// Perform a bottom up traversal of all children.
for (Stmt::child_range CI = S->children(); CI; ++CI)
if (*CI)
WarnAboutReturnGotoStmts(*CI);
if (isa<ReturnStmt>(S) || isa<GotoStmt>(S)) {
Diags.Report(Context->getFullLoc(S->getLocStart()),
TryFinallyContainsReturnDiag);
}
return;
}
void RewriteObjC::HasReturnStmts(Stmt *S, bool &hasReturns)
{
// Perform a bottom up traversal of all children.
for (Stmt::child_range CI = S->children(); CI; ++CI)
if (*CI)
HasReturnStmts(*CI, hasReturns);
if (isa<ReturnStmt>(S))
hasReturns = true;
return;
}
void RewriteObjC::RewriteTryReturnStmts(Stmt *S) {
// Perform a bottom up traversal of all children.
for (Stmt::child_range CI = S->children(); CI; ++CI)
if (*CI) {
RewriteTryReturnStmts(*CI);
}
if (isa<ReturnStmt>(S)) {
SourceLocation startLoc = S->getLocStart();
const char *startBuf = SM->getCharacterData(startLoc);
const char *semiBuf = strchr(startBuf, ';');
assert((*semiBuf == ';') && "RewriteTryReturnStmts: can't find ';'");
SourceLocation onePastSemiLoc = startLoc.getLocWithOffset(semiBuf-startBuf+1);
std::string buf;
buf = "{ objc_exception_try_exit(&_stack); return";
ReplaceText(startLoc, 6, buf);
InsertText(onePastSemiLoc, "}");
}
return;
}
void RewriteObjC::RewriteSyncReturnStmts(Stmt *S, std::string syncExitBuf) {
// Perform a bottom up traversal of all children.
for (Stmt::child_range CI = S->children(); CI; ++CI)
if (*CI) {
RewriteSyncReturnStmts(*CI, syncExitBuf);
}
if (isa<ReturnStmt>(S)) {
SourceLocation startLoc = S->getLocStart();
const char *startBuf = SM->getCharacterData(startLoc);
const char *semiBuf = strchr(startBuf, ';');
assert((*semiBuf == ';') && "RewriteSyncReturnStmts: can't find ';'");
SourceLocation onePastSemiLoc = startLoc.getLocWithOffset(semiBuf-startBuf+1);
std::string buf;
buf = "{ objc_exception_try_exit(&_stack);";
buf += syncExitBuf;
buf += " return";
ReplaceText(startLoc, 6, buf);
InsertText(onePastSemiLoc, "}");
}
return;
}
Stmt *RewriteObjC::RewriteObjCTryStmt(ObjCAtTryStmt *S) {
// Get the start location and compute the semi location.
SourceLocation startLoc = S->getLocStart();
const char *startBuf = SM->getCharacterData(startLoc);
assert((*startBuf == '@') && "bogus @try location");
std::string buf;
// declare a new scope with two variables, _stack and _rethrow.
buf = "/* @try scope begin */ { struct _objc_exception_data {\n";
buf += "int buf[18/*32-bit i386*/];\n";
buf += "char *pointers[4];} _stack;\n";
buf += "id volatile _rethrow = 0;\n";
buf += "objc_exception_try_enter(&_stack);\n";
buf += "if (!_setjmp(_stack.buf)) /* @try block continue */\n";
ReplaceText(startLoc, 4, buf);
startLoc = S->getTryBody()->getLocEnd();
startBuf = SM->getCharacterData(startLoc);
assert((*startBuf == '}') && "bogus @try block");
SourceLocation lastCurlyLoc = startLoc;
if (S->getNumCatchStmts()) {
startLoc = startLoc.getLocWithOffset(1);
buf = " /* @catch begin */ else {\n";
buf += " id _caught = objc_exception_extract(&_stack);\n";
buf += " objc_exception_try_enter (&_stack);\n";
buf += " if (_setjmp(_stack.buf))\n";
buf += " _rethrow = objc_exception_extract(&_stack);\n";
buf += " else { /* @catch continue */";
InsertText(startLoc, buf);
} else { /* no catch list */
buf = "}\nelse {\n";
buf += " _rethrow = objc_exception_extract(&_stack);\n";
buf += "}";
ReplaceText(lastCurlyLoc, 1, buf);
}
Stmt *lastCatchBody = nullptr;
for (unsigned I = 0, N = S->getNumCatchStmts(); I != N; ++I) {
ObjCAtCatchStmt *Catch = S->getCatchStmt(I);
VarDecl *catchDecl = Catch->getCatchParamDecl();
if (I == 0)
buf = "if ("; // we are generating code for the first catch clause
else
buf = "else if (";
startLoc = Catch->getLocStart();
startBuf = SM->getCharacterData(startLoc);
assert((*startBuf == '@') && "bogus @catch location");
const char *lParenLoc = strchr(startBuf, '(');
if (Catch->hasEllipsis()) {
// Now rewrite the body...
lastCatchBody = Catch->getCatchBody();
SourceLocation bodyLoc = lastCatchBody->getLocStart();
const char *bodyBuf = SM->getCharacterData(bodyLoc);
assert(*SM->getCharacterData(Catch->getRParenLoc()) == ')' &&
"bogus @catch paren location");
assert((*bodyBuf == '{') && "bogus @catch body location");
buf += "1) { id _tmp = _caught;";
Rewrite.ReplaceText(startLoc, bodyBuf-startBuf+1, buf);
} else if (catchDecl) {
QualType t = catchDecl->getType();
if (t == Context->getObjCIdType()) {
buf += "1) { ";
ReplaceText(startLoc, lParenLoc-startBuf+1, buf);
} else if (const ObjCObjectPointerType *Ptr =
t->getAs<ObjCObjectPointerType>()) {
// Should be a pointer to a class.
ObjCInterfaceDecl *IDecl = Ptr->getObjectType()->getInterface();
if (IDecl) {
buf += "objc_exception_match((struct objc_class *)objc_getClass(\"";
buf += IDecl->getNameAsString();
buf += "\"), (struct objc_object *)_caught)) { ";
ReplaceText(startLoc, lParenLoc-startBuf+1, buf);
}
}
// Now rewrite the body...
lastCatchBody = Catch->getCatchBody();
SourceLocation rParenLoc = Catch->getRParenLoc();
SourceLocation bodyLoc = lastCatchBody->getLocStart();
const char *bodyBuf = SM->getCharacterData(bodyLoc);
const char *rParenBuf = SM->getCharacterData(rParenLoc);
assert((*rParenBuf == ')') && "bogus @catch paren location");
assert((*bodyBuf == '{') && "bogus @catch body location");
// Here we replace ") {" with "= _caught;" (which initializes and
// declares the @catch parameter).
ReplaceText(rParenLoc, bodyBuf-rParenBuf+1, " = _caught;");
} else {
llvm_unreachable("@catch rewrite bug");
}
}
// Complete the catch list...
if (lastCatchBody) {
SourceLocation bodyLoc = lastCatchBody->getLocEnd();
assert(*SM->getCharacterData(bodyLoc) == '}' &&
"bogus @catch body location");
// Insert the last (implicit) else clause *before* the right curly brace.
bodyLoc = bodyLoc.getLocWithOffset(-1);
buf = "} /* last catch end */\n";
buf += "else {\n";
buf += " _rethrow = _caught;\n";
buf += " objc_exception_try_exit(&_stack);\n";
buf += "} } /* @catch end */\n";
if (!S->getFinallyStmt())
buf += "}\n";
InsertText(bodyLoc, buf);
// Set lastCurlyLoc
lastCurlyLoc = lastCatchBody->getLocEnd();
}
if (ObjCAtFinallyStmt *finalStmt = S->getFinallyStmt()) {
startLoc = finalStmt->getLocStart();
startBuf = SM->getCharacterData(startLoc);
assert((*startBuf == '@') && "bogus @finally start");
ReplaceText(startLoc, 8, "/* @finally */");
Stmt *body = finalStmt->getFinallyBody();
SourceLocation startLoc = body->getLocStart();
SourceLocation endLoc = body->getLocEnd();
assert(*SM->getCharacterData(startLoc) == '{' &&
"bogus @finally body location");
assert(*SM->getCharacterData(endLoc) == '}' &&
"bogus @finally body location");
startLoc = startLoc.getLocWithOffset(1);
InsertText(startLoc, " if (!_rethrow) objc_exception_try_exit(&_stack);\n");
endLoc = endLoc.getLocWithOffset(-1);
InsertText(endLoc, " if (_rethrow) objc_exception_throw(_rethrow);\n");
// Set lastCurlyLoc
lastCurlyLoc = body->getLocEnd();
// Now check for any return/continue/go statements within the @try.
WarnAboutReturnGotoStmts(S->getTryBody());
} else { /* no finally clause - make sure we synthesize an implicit one */
buf = "{ /* implicit finally clause */\n";
buf += " if (!_rethrow) objc_exception_try_exit(&_stack);\n";
buf += " if (_rethrow) objc_exception_throw(_rethrow);\n";
buf += "}";
ReplaceText(lastCurlyLoc, 1, buf);
// Now check for any return/continue/go statements within the @try.
// The implicit finally clause won't called if the @try contains any
// jump statements.
bool hasReturns = false;
HasReturnStmts(S->getTryBody(), hasReturns);
if (hasReturns)
RewriteTryReturnStmts(S->getTryBody());
}
// Now emit the final closing curly brace...
lastCurlyLoc = lastCurlyLoc.getLocWithOffset(1);
InsertText(lastCurlyLoc, " } /* @try scope end */\n");
return nullptr;
}
// This can't be done with ReplaceStmt(S, ThrowExpr), since
// the throw expression is typically a message expression that's already
// been rewritten! (which implies the SourceLocation's are invalid).
Stmt *RewriteObjC::RewriteObjCThrowStmt(ObjCAtThrowStmt *S) {
// Get the start location and compute the semi location.
SourceLocation startLoc = S->getLocStart();
const char *startBuf = SM->getCharacterData(startLoc);
assert((*startBuf == '@') && "bogus @throw location");
std::string buf;
/* void objc_exception_throw(id) __attribute__((noreturn)); */
if (S->getThrowExpr())
buf = "objc_exception_throw(";
else // add an implicit argument
buf = "objc_exception_throw(_caught";
// handle "@ throw" correctly.
const char *wBuf = strchr(startBuf, 'w');
assert((*wBuf == 'w') && "@throw: can't find 'w'");
ReplaceText(startLoc, wBuf-startBuf+1, buf);
const char *semiBuf = strchr(startBuf, ';');
assert((*semiBuf == ';') && "@throw: can't find ';'");
SourceLocation semiLoc = startLoc.getLocWithOffset(semiBuf-startBuf);
ReplaceText(semiLoc, 1, ");");
return nullptr;
}
Stmt *RewriteObjC::RewriteAtEncode(ObjCEncodeExpr *Exp) {
// Create a new string expression.
std::string StrEncoding;
Context->getObjCEncodingForType(Exp->getEncodedType(), StrEncoding);
Expr *Replacement = getStringLiteral(StrEncoding);
ReplaceStmt(Exp, Replacement);
// Replace this subexpr in the parent.
// delete Exp; leak for now, see RewritePropertyOrImplicitSetter() usage for more info.
return Replacement;
}
Stmt *RewriteObjC::RewriteAtSelector(ObjCSelectorExpr *Exp) {
if (!SelGetUidFunctionDecl)
SynthSelGetUidFunctionDecl();
assert(SelGetUidFunctionDecl && "Can't find sel_registerName() decl");
// Create a call to sel_registerName("selName").
SmallVector<Expr*, 8> SelExprs;
SelExprs.push_back(getStringLiteral(Exp->getSelector().getAsString()));
CallExpr *SelExp = SynthesizeCallToFunctionDecl(SelGetUidFunctionDecl,
&SelExprs[0], SelExprs.size());
ReplaceStmt(Exp, SelExp);
// delete Exp; leak for now, see RewritePropertyOrImplicitSetter() usage for more info.
return SelExp;
}
CallExpr *RewriteObjC::SynthesizeCallToFunctionDecl(
FunctionDecl *FD, Expr **args, unsigned nargs, SourceLocation StartLoc,
SourceLocation EndLoc) {
// Get the type, we will need to reference it in a couple spots.
QualType msgSendType = FD->getType();
// Create a reference to the objc_msgSend() declaration.
DeclRefExpr *DRE = new (Context) DeclRefExpr(FD, false, msgSendType,
VK_LValue, SourceLocation());
// Now, we cast the reference to a pointer to the objc_msgSend type.
QualType pToFunc = Context->getPointerType(msgSendType);
ImplicitCastExpr *ICE =
ImplicitCastExpr::Create(*Context, pToFunc, CK_FunctionToPointerDecay,
DRE, nullptr, VK_RValue);
const FunctionType *FT = msgSendType->getAs<FunctionType>();
CallExpr *Exp =
new (Context) CallExpr(*Context, ICE, llvm::makeArrayRef(args, nargs),
FT->getCallResultType(*Context),
VK_RValue, EndLoc);
return Exp;
}
static bool scanForProtocolRefs(const char *startBuf, const char *endBuf,
const char *&startRef, const char *&endRef) {
while (startBuf < endBuf) {
if (*startBuf == '<')
startRef = startBuf; // mark the start.
if (*startBuf == '>') {
if (startRef && *startRef == '<') {
endRef = startBuf; // mark the end.
return true;
}
return false;
}
startBuf++;
}
return false;
}
static void scanToNextArgument(const char *&argRef) {
int angle = 0;
while (*argRef != ')' && (*argRef != ',' || angle > 0)) {
if (*argRef == '<')
angle++;
else if (*argRef == '>')
angle--;
argRef++;
}
assert(angle == 0 && "scanToNextArgument - bad protocol type syntax");
}
bool RewriteObjC::needToScanForQualifiers(QualType T) {
if (T->isObjCQualifiedIdType())
return true;
if (const PointerType *PT = T->getAs<PointerType>()) {
if (PT->getPointeeType()->isObjCQualifiedIdType())
return true;
}
if (T->isObjCObjectPointerType()) {
T = T->getPointeeType();
return T->isObjCQualifiedInterfaceType();
}
if (T->isArrayType()) {
QualType ElemTy = Context->getBaseElementType(T);
return needToScanForQualifiers(ElemTy);
}
return false;
}
void RewriteObjC::RewriteObjCQualifiedInterfaceTypes(Expr *E) {
QualType Type = E->getType();
if (needToScanForQualifiers(Type)) {
SourceLocation Loc, EndLoc;
if (const CStyleCastExpr *ECE = dyn_cast<CStyleCastExpr>(E)) {
Loc = ECE->getLParenLoc();
EndLoc = ECE->getRParenLoc();
} else {
Loc = E->getLocStart();
EndLoc = E->getLocEnd();
}
// This will defend against trying to rewrite synthesized expressions.
if (Loc.isInvalid() || EndLoc.isInvalid())
return;
const char *startBuf = SM->getCharacterData(Loc);
const char *endBuf = SM->getCharacterData(EndLoc);
const char *startRef = nullptr, *endRef = nullptr;
if (scanForProtocolRefs(startBuf, endBuf, startRef, endRef)) {
// Get the locations of the startRef, endRef.
SourceLocation LessLoc = Loc.getLocWithOffset(startRef-startBuf);
SourceLocation GreaterLoc = Loc.getLocWithOffset(endRef-startBuf+1);
// Comment out the protocol references.
InsertText(LessLoc, "/*");
InsertText(GreaterLoc, "*/");
}
}
}
void RewriteObjC::RewriteObjCQualifiedInterfaceTypes(Decl *Dcl) {
SourceLocation Loc;
QualType Type;
const FunctionProtoType *proto = nullptr;
if (VarDecl *VD = dyn_cast<VarDecl>(Dcl)) {
Loc = VD->getLocation();
Type = VD->getType();
}
else if (FunctionDecl *FD = dyn_cast<FunctionDecl>(Dcl)) {
Loc = FD->getLocation();
// Check for ObjC 'id' and class types that have been adorned with protocol
// information (id<p>, C<p>*). The protocol references need to be rewritten!
const FunctionType *funcType = FD->getType()->getAs<FunctionType>();
assert(funcType && "missing function type");
proto = dyn_cast<FunctionProtoType>(funcType);
if (!proto)
return;
Type = proto->getReturnType();
}
else if (FieldDecl *FD = dyn_cast<FieldDecl>(Dcl)) {
Loc = FD->getLocation();
Type = FD->getType();
}
else
return;
if (needToScanForQualifiers(Type)) {
// Since types are unique, we need to scan the buffer.
const char *endBuf = SM->getCharacterData(Loc);
const char *startBuf = endBuf;
while (*startBuf != ';' && *startBuf != '<' && startBuf != MainFileStart)
startBuf--; // scan backward (from the decl location) for return type.
const char *startRef = nullptr, *endRef = nullptr;
if (scanForProtocolRefs(startBuf, endBuf, startRef, endRef)) {
// Get the locations of the startRef, endRef.
SourceLocation LessLoc = Loc.getLocWithOffset(startRef-endBuf);
SourceLocation GreaterLoc = Loc.getLocWithOffset(endRef-endBuf+1);
// Comment out the protocol references.
InsertText(LessLoc, "/*");
InsertText(GreaterLoc, "*/");
}
}
if (!proto)
return; // most likely, was a variable
// Now check arguments.
const char *startBuf = SM->getCharacterData(Loc);
const char *startFuncBuf = startBuf;
for (unsigned i = 0; i < proto->getNumParams(); i++) {
if (needToScanForQualifiers(proto->getParamType(i))) {
// Since types are unique, we need to scan the buffer.
const char *endBuf = startBuf;
// scan forward (from the decl location) for argument types.
scanToNextArgument(endBuf);
const char *startRef = nullptr, *endRef = nullptr;
if (scanForProtocolRefs(startBuf, endBuf, startRef, endRef)) {
// Get the locations of the startRef, endRef.
SourceLocation LessLoc =
Loc.getLocWithOffset(startRef-startFuncBuf);
SourceLocation GreaterLoc =
Loc.getLocWithOffset(endRef-startFuncBuf+1);
// Comment out the protocol references.
InsertText(LessLoc, "/*");
InsertText(GreaterLoc, "*/");
}
startBuf = ++endBuf;
}
else {
// If the function name is derived from a macro expansion, then the
// argument buffer will not follow the name. Need to speak with Chris.
while (*startBuf && *startBuf != ')' && *startBuf != ',')
startBuf++; // scan forward (from the decl location) for argument types.
startBuf++;
}
}
}
void RewriteObjC::RewriteTypeOfDecl(VarDecl *ND) {
QualType QT = ND->getType();
const Type* TypePtr = QT->getAs<Type>();
if (!isa<TypeOfExprType>(TypePtr))
return;
while (isa<TypeOfExprType>(TypePtr)) {
const TypeOfExprType *TypeOfExprTypePtr = cast<TypeOfExprType>(TypePtr);
QT = TypeOfExprTypePtr->getUnderlyingExpr()->getType();
TypePtr = QT->getAs<Type>();
}
// FIXME. This will not work for multiple declarators; as in:
// __typeof__(a) b,c,d;
std::string TypeAsString(QT.getAsString(Context->getPrintingPolicy()));
SourceLocation DeclLoc = ND->getTypeSpecStartLoc();
const char *startBuf = SM->getCharacterData(DeclLoc);
if (ND->getInit()) {
std::string Name(ND->getNameAsString());
TypeAsString += " " + Name + " = ";
Expr *E = ND->getInit();
SourceLocation startLoc;
if (const CStyleCastExpr *ECE = dyn_cast<CStyleCastExpr>(E))
startLoc = ECE->getLParenLoc();
else
startLoc = E->getLocStart();
startLoc = SM->getExpansionLoc(startLoc);
const char *endBuf = SM->getCharacterData(startLoc);
ReplaceText(DeclLoc, endBuf-startBuf-1, TypeAsString);
}
else {
SourceLocation X = ND->getLocEnd();
X = SM->getExpansionLoc(X);
const char *endBuf = SM->getCharacterData(X);
ReplaceText(DeclLoc, endBuf-startBuf-1, TypeAsString);
}
}
// SynthSelGetUidFunctionDecl - SEL sel_registerName(const char *str);
void RewriteObjC::SynthSelGetUidFunctionDecl() {
IdentifierInfo *SelGetUidIdent = &Context->Idents.get("sel_registerName");
SmallVector<QualType, 16> ArgTys;
ArgTys.push_back(Context->getPointerType(Context->CharTy.withConst()));
QualType getFuncType =
getSimpleFunctionType(Context->getObjCSelType(), ArgTys);
SelGetUidFunctionDecl = FunctionDecl::Create(*Context, TUDecl,
SourceLocation(),
SourceLocation(),
SelGetUidIdent, getFuncType,
nullptr, SC_Extern);
}
void RewriteObjC::RewriteFunctionDecl(FunctionDecl *FD) {
// declared in <objc/objc.h>
if (FD->getIdentifier() &&
FD->getName() == "sel_registerName") {
SelGetUidFunctionDecl = FD;
return;
}
RewriteObjCQualifiedInterfaceTypes(FD);
}
void RewriteObjC::RewriteBlockPointerType(std::string& Str, QualType Type) {
std::string TypeString(Type.getAsString(Context->getPrintingPolicy()));
const char *argPtr = TypeString.c_str();
if (!strchr(argPtr, '^')) {
Str += TypeString;
return;
}
while (*argPtr) {
Str += (*argPtr == '^' ? '*' : *argPtr);
argPtr++;
}
}
// FIXME. Consolidate this routine with RewriteBlockPointerType.
void RewriteObjC::RewriteBlockPointerTypeVariable(std::string& Str,
ValueDecl *VD) {
QualType Type = VD->getType();
std::string TypeString(Type.getAsString(Context->getPrintingPolicy()));
const char *argPtr = TypeString.c_str();
int paren = 0;
while (*argPtr) {
switch (*argPtr) {
case '(':
Str += *argPtr;
paren++;
break;
case ')':
Str += *argPtr;
paren--;
break;
case '^':
Str += '*';
if (paren == 1)
Str += VD->getNameAsString();
break;
default:
Str += *argPtr;
break;
}
argPtr++;
}
}
void RewriteObjC::RewriteBlockLiteralFunctionDecl(FunctionDecl *FD) {
SourceLocation FunLocStart = FD->getTypeSpecStartLoc();
const FunctionType *funcType = FD->getType()->getAs<FunctionType>();
const FunctionProtoType *proto = dyn_cast<FunctionProtoType>(funcType);
if (!proto)
return;
QualType Type = proto->getReturnType();
std::string FdStr = Type.getAsString(Context->getPrintingPolicy());
FdStr += " ";
FdStr += FD->getName();
FdStr += "(";
unsigned numArgs = proto->getNumParams();
for (unsigned i = 0; i < numArgs; i++) {
QualType ArgType = proto->getParamType(i);
RewriteBlockPointerType(FdStr, ArgType);
if (i+1 < numArgs)
FdStr += ", ";
}
FdStr += ");\n";
InsertText(FunLocStart, FdStr);
CurFunctionDeclToDeclareForBlock = nullptr;
}
// SynthSuperConstructorFunctionDecl - id objc_super(id obj, id super);
void RewriteObjC::SynthSuperConstructorFunctionDecl() {
if (SuperConstructorFunctionDecl)
return;
IdentifierInfo *msgSendIdent = &Context->Idents.get("__rw_objc_super");
SmallVector<QualType, 16> ArgTys;
QualType argT = Context->getObjCIdType();
assert(!argT.isNull() && "Can't find 'id' type");
ArgTys.push_back(argT);
ArgTys.push_back(argT);
QualType msgSendType = getSimpleFunctionType(Context->getObjCIdType(),
ArgTys);
SuperConstructorFunctionDecl = FunctionDecl::Create(*Context, TUDecl,
SourceLocation(),
SourceLocation(),
msgSendIdent, msgSendType,
nullptr, SC_Extern);
}
// SynthMsgSendFunctionDecl - id objc_msgSend(id self, SEL op, ...);
void RewriteObjC::SynthMsgSendFunctionDecl() {
IdentifierInfo *msgSendIdent = &Context->Idents.get("objc_msgSend");
SmallVector<QualType, 16> ArgTys;
QualType argT = Context->getObjCIdType();
assert(!argT.isNull() && "Can't find 'id' type");
ArgTys.push_back(argT);
argT = Context->getObjCSelType();
assert(!argT.isNull() && "Can't find 'SEL' type");
ArgTys.push_back(argT);
QualType msgSendType = getSimpleFunctionType(Context->getObjCIdType(),
ArgTys, /*isVariadic=*/true);
MsgSendFunctionDecl = FunctionDecl::Create(*Context, TUDecl,
SourceLocation(),
SourceLocation(),
msgSendIdent, msgSendType,
nullptr, SC_Extern);
}
// SynthMsgSendSuperFunctionDecl - id objc_msgSendSuper(struct objc_super *, SEL op, ...);
void RewriteObjC::SynthMsgSendSuperFunctionDecl() {
IdentifierInfo *msgSendIdent = &Context->Idents.get("objc_msgSendSuper");
SmallVector<QualType, 16> ArgTys;
RecordDecl *RD = RecordDecl::Create(*Context, TTK_Struct, TUDecl,
SourceLocation(), SourceLocation(),
&Context->Idents.get("objc_super"));
QualType argT = Context->getPointerType(Context->getTagDeclType(RD));
assert(!argT.isNull() && "Can't build 'struct objc_super *' type");
ArgTys.push_back(argT);
argT = Context->getObjCSelType();
assert(!argT.isNull() && "Can't find 'SEL' type");
ArgTys.push_back(argT);
QualType msgSendType = getSimpleFunctionType(Context->getObjCIdType(),
ArgTys, /*isVariadic=*/true);
MsgSendSuperFunctionDecl = FunctionDecl::Create(*Context, TUDecl,
SourceLocation(),
SourceLocation(),
msgSendIdent, msgSendType,
nullptr, SC_Extern);
}
// SynthMsgSendStretFunctionDecl - id objc_msgSend_stret(id self, SEL op, ...);
void RewriteObjC::SynthMsgSendStretFunctionDecl() {
IdentifierInfo *msgSendIdent = &Context->Idents.get("objc_msgSend_stret");
SmallVector<QualType, 16> ArgTys;
QualType argT = Context->getObjCIdType();
assert(!argT.isNull() && "Can't find 'id' type");
ArgTys.push_back(argT);
argT = Context->getObjCSelType();
assert(!argT.isNull() && "Can't find 'SEL' type");
ArgTys.push_back(argT);
QualType msgSendType = getSimpleFunctionType(Context->getObjCIdType(),
ArgTys, /*isVariadic=*/true);
MsgSendStretFunctionDecl = FunctionDecl::Create(*Context, TUDecl,
SourceLocation(),
SourceLocation(),
msgSendIdent, msgSendType,
nullptr, SC_Extern);
}
// SynthMsgSendSuperStretFunctionDecl -
// id objc_msgSendSuper_stret(struct objc_super *, SEL op, ...);
void RewriteObjC::SynthMsgSendSuperStretFunctionDecl() {
IdentifierInfo *msgSendIdent =
&Context->Idents.get("objc_msgSendSuper_stret");
SmallVector<QualType, 16> ArgTys;
RecordDecl *RD = RecordDecl::Create(*Context, TTK_Struct, TUDecl,
SourceLocation(), SourceLocation(),
&Context->Idents.get("objc_super"));
QualType argT = Context->getPointerType(Context->getTagDeclType(RD));
assert(!argT.isNull() && "Can't build 'struct objc_super *' type");
ArgTys.push_back(argT);
argT = Context->getObjCSelType();
assert(!argT.isNull() && "Can't find 'SEL' type");
ArgTys.push_back(argT);
QualType msgSendType = getSimpleFunctionType(Context->getObjCIdType(),
ArgTys, /*isVariadic=*/true);
MsgSendSuperStretFunctionDecl = FunctionDecl::Create(*Context, TUDecl,
SourceLocation(),
SourceLocation(),
msgSendIdent,
msgSendType, nullptr,
SC_Extern);
}
// SynthMsgSendFpretFunctionDecl - double objc_msgSend_fpret(id self, SEL op, ...);
void RewriteObjC::SynthMsgSendFpretFunctionDecl() {
IdentifierInfo *msgSendIdent = &Context->Idents.get("objc_msgSend_fpret");
SmallVector<QualType, 16> ArgTys;
QualType argT = Context->getObjCIdType();
assert(!argT.isNull() && "Can't find 'id' type");
ArgTys.push_back(argT);
argT = Context->getObjCSelType();
assert(!argT.isNull() && "Can't find 'SEL' type");
ArgTys.push_back(argT);
QualType msgSendType = getSimpleFunctionType(Context->DoubleTy,
ArgTys, /*isVariadic=*/true);
MsgSendFpretFunctionDecl = FunctionDecl::Create(*Context, TUDecl,
SourceLocation(),
SourceLocation(),
msgSendIdent, msgSendType,
nullptr, SC_Extern);
}
// SynthGetClassFunctionDecl - id objc_getClass(const char *name);
void RewriteObjC::SynthGetClassFunctionDecl() {
IdentifierInfo *getClassIdent = &Context->Idents.get("objc_getClass");
SmallVector<QualType, 16> ArgTys;
ArgTys.push_back(Context->getPointerType(Context->CharTy.withConst()));
QualType getClassType = getSimpleFunctionType(Context->getObjCIdType(),
ArgTys);
GetClassFunctionDecl = FunctionDecl::Create(*Context, TUDecl,
SourceLocation(),
SourceLocation(),
getClassIdent, getClassType,
nullptr, SC_Extern);
}
// SynthGetSuperClassFunctionDecl - Class class_getSuperclass(Class cls);
void RewriteObjC::SynthGetSuperClassFunctionDecl() {
IdentifierInfo *getSuperClassIdent =
&Context->Idents.get("class_getSuperclass");
SmallVector<QualType, 16> ArgTys;
ArgTys.push_back(Context->getObjCClassType());
QualType getClassType = getSimpleFunctionType(Context->getObjCClassType(),
ArgTys);
GetSuperClassFunctionDecl = FunctionDecl::Create(*Context, TUDecl,
SourceLocation(),
SourceLocation(),
getSuperClassIdent,
getClassType, nullptr,
SC_Extern);
}
// SynthGetMetaClassFunctionDecl - id objc_getMetaClass(const char *name);
void RewriteObjC::SynthGetMetaClassFunctionDecl() {
IdentifierInfo *getClassIdent = &Context->Idents.get("objc_getMetaClass");
SmallVector<QualType, 16> ArgTys;
ArgTys.push_back(Context->getPointerType(Context->CharTy.withConst()));
QualType getClassType = getSimpleFunctionType(Context->getObjCIdType(),
ArgTys);
GetMetaClassFunctionDecl = FunctionDecl::Create(*Context, TUDecl,
SourceLocation(),
SourceLocation(),
getClassIdent, getClassType,
nullptr, SC_Extern);
}
Stmt *RewriteObjC::RewriteObjCStringLiteral(ObjCStringLiteral *Exp) {
assert(Exp != nullptr && "Expected non-null ObjCStringLiteral");
QualType strType = getConstantStringStructType();
std::string S = "__NSConstantStringImpl_";
std::string tmpName = InFileName;
unsigned i;
for (i=0; i < tmpName.length(); i++) {
char c = tmpName.at(i);
// replace any non-alphanumeric characters with '_'.
if (!isAlphanumeric(c))
tmpName[i] = '_';
}
S += tmpName;
S += "_";
S += utostr(NumObjCStringLiterals++);
Preamble += "static __NSConstantStringImpl " + S;
Preamble += " __attribute__ ((section (\"__DATA, __cfstring\"))) = {__CFConstantStringClassReference,";
Preamble += "0x000007c8,"; // utf8_str
// The pretty printer for StringLiteral handles escape characters properly.
std::string prettyBufS;
llvm::raw_string_ostream prettyBuf(prettyBufS);
Exp->getString()->printPretty(prettyBuf, nullptr, PrintingPolicy(LangOpts));
Preamble += prettyBuf.str();
Preamble += ",";
Preamble += utostr(Exp->getString()->getByteLength()) + "};\n";
VarDecl *NewVD = VarDecl::Create(*Context, TUDecl, SourceLocation(),
SourceLocation(), &Context->Idents.get(S),
strType, nullptr, SC_Static);
DeclRefExpr *DRE = new (Context) DeclRefExpr(NewVD, false, strType, VK_LValue,
SourceLocation());
Expr *Unop = new (Context) UnaryOperator(DRE, UO_AddrOf,
Context->getPointerType(DRE->getType()),
VK_RValue, OK_Ordinary,
SourceLocation());
// cast to NSConstantString *
CastExpr *cast = NoTypeInfoCStyleCastExpr(Context, Exp->getType(),
CK_CPointerToObjCPointerCast, Unop);
ReplaceStmt(Exp, cast);
// delete Exp; leak for now, see RewritePropertyOrImplicitSetter() usage for more info.
return cast;
}
// struct objc_super { struct objc_object *receiver; struct objc_class *super; };
QualType RewriteObjC::getSuperStructType() {
if (!SuperStructDecl) {
SuperStructDecl = RecordDecl::Create(*Context, TTK_Struct, TUDecl,
SourceLocation(), SourceLocation(),
&Context->Idents.get("objc_super"));
QualType FieldTypes[2];
// struct objc_object *receiver;
FieldTypes[0] = Context->getObjCIdType();
// struct objc_class *super;
FieldTypes[1] = Context->getObjCClassType();
// Create fields
for (unsigned i = 0; i < 2; ++i) {
SuperStructDecl->addDecl(FieldDecl::Create(*Context, SuperStructDecl,
SourceLocation(),
SourceLocation(), nullptr,
FieldTypes[i], nullptr,
/*BitWidth=*/nullptr,
/*Mutable=*/false,
ICIS_NoInit));
}
SuperStructDecl->completeDefinition();
}
return Context->getTagDeclType(SuperStructDecl);
}
QualType RewriteObjC::getConstantStringStructType() {
if (!ConstantStringDecl) {
ConstantStringDecl = RecordDecl::Create(*Context, TTK_Struct, TUDecl,
SourceLocation(), SourceLocation(),
&Context->Idents.get("__NSConstantStringImpl"));
QualType FieldTypes[4];
// struct objc_object *receiver;
FieldTypes[0] = Context->getObjCIdType();
// int flags;
FieldTypes[1] = Context->IntTy;
// char *str;
FieldTypes[2] = Context->getPointerType(Context->CharTy);
// long length;
FieldTypes[3] = Context->LongTy;
// Create fields
for (unsigned i = 0; i < 4; ++i) {
ConstantStringDecl->addDecl(FieldDecl::Create(*Context,
ConstantStringDecl,
SourceLocation(),
SourceLocation(), nullptr,
FieldTypes[i], nullptr,
/*BitWidth=*/nullptr,
/*Mutable=*/true,
ICIS_NoInit));
}
ConstantStringDecl->completeDefinition();
}
return Context->getTagDeclType(ConstantStringDecl);
}
CallExpr *RewriteObjC::SynthMsgSendStretCallExpr(FunctionDecl *MsgSendStretFlavor,
QualType msgSendType,
QualType returnType,
SmallVectorImpl<QualType> &ArgTypes,
SmallVectorImpl<Expr*> &MsgExprs,
ObjCMethodDecl *Method) {
// Create a reference to the objc_msgSend_stret() declaration.
DeclRefExpr *STDRE = new (Context) DeclRefExpr(MsgSendStretFlavor,
false, msgSendType,
VK_LValue, SourceLocation());
// Need to cast objc_msgSend_stret to "void *" (see above comment).
CastExpr *cast = NoTypeInfoCStyleCastExpr(Context,
Context->getPointerType(Context->VoidTy),
CK_BitCast, STDRE);
// Now do the "normal" pointer to function cast.
QualType castType = getSimpleFunctionType(returnType, ArgTypes,
Method ? Method->isVariadic()
: false);
castType = Context->getPointerType(castType);
cast = NoTypeInfoCStyleCastExpr(Context, castType, CK_BitCast,
cast);
// Don't forget the parens to enforce the proper binding.
ParenExpr *PE = new (Context) ParenExpr(SourceLocation(), SourceLocation(), cast);
const FunctionType *FT = msgSendType->getAs<FunctionType>();
CallExpr *STCE = new (Context) CallExpr(
*Context, PE, MsgExprs, FT->getReturnType(), VK_RValue, SourceLocation());
return STCE;
}
Stmt *RewriteObjC::SynthMessageExpr(ObjCMessageExpr *Exp,
SourceLocation StartLoc,
SourceLocation EndLoc) {
if (!SelGetUidFunctionDecl)
SynthSelGetUidFunctionDecl();
if (!MsgSendFunctionDecl)
SynthMsgSendFunctionDecl();
if (!MsgSendSuperFunctionDecl)
SynthMsgSendSuperFunctionDecl();
if (!MsgSendStretFunctionDecl)
SynthMsgSendStretFunctionDecl();
if (!MsgSendSuperStretFunctionDecl)
SynthMsgSendSuperStretFunctionDecl();
if (!MsgSendFpretFunctionDecl)
SynthMsgSendFpretFunctionDecl();
if (!GetClassFunctionDecl)
SynthGetClassFunctionDecl();
if (!GetSuperClassFunctionDecl)
SynthGetSuperClassFunctionDecl();
if (!GetMetaClassFunctionDecl)
SynthGetMetaClassFunctionDecl();
// default to objc_msgSend().
FunctionDecl *MsgSendFlavor = MsgSendFunctionDecl;
// May need to use objc_msgSend_stret() as well.
FunctionDecl *MsgSendStretFlavor = nullptr;
if (ObjCMethodDecl *mDecl = Exp->getMethodDecl()) {
QualType resultType = mDecl->getReturnType();
if (resultType->isRecordType())
MsgSendStretFlavor = MsgSendStretFunctionDecl;
else if (resultType->isRealFloatingType())
MsgSendFlavor = MsgSendFpretFunctionDecl;
}
// Synthesize a call to objc_msgSend().
SmallVector<Expr*, 8> MsgExprs;
switch (Exp->getReceiverKind()) {
case ObjCMessageExpr::SuperClass: {
MsgSendFlavor = MsgSendSuperFunctionDecl;
if (MsgSendStretFlavor)
MsgSendStretFlavor = MsgSendSuperStretFunctionDecl;
assert(MsgSendFlavor && "MsgSendFlavor is NULL!");
ObjCInterfaceDecl *ClassDecl = CurMethodDef->getClassInterface();
SmallVector<Expr*, 4> InitExprs;
// set the receiver to self, the first argument to all methods.
InitExprs.push_back(
NoTypeInfoCStyleCastExpr(Context, Context->getObjCIdType(),
CK_BitCast,
new (Context) DeclRefExpr(CurMethodDef->getSelfDecl(),
false,
Context->getObjCIdType(),
VK_RValue,
SourceLocation()))
); // set the 'receiver'.
// (id)class_getSuperclass((Class)objc_getClass("CurrentClass"))
SmallVector<Expr*, 8> ClsExprs;
ClsExprs.push_back(getStringLiteral(ClassDecl->getIdentifier()->getName()));
CallExpr *Cls = SynthesizeCallToFunctionDecl(GetMetaClassFunctionDecl,
&ClsExprs[0],
ClsExprs.size(),
StartLoc,
EndLoc);
// (Class)objc_getClass("CurrentClass")
CastExpr *ArgExpr = NoTypeInfoCStyleCastExpr(Context,
Context->getObjCClassType(),
CK_BitCast, Cls);
ClsExprs.clear();
ClsExprs.push_back(ArgExpr);
Cls = SynthesizeCallToFunctionDecl(GetSuperClassFunctionDecl,
&ClsExprs[0], ClsExprs.size(),
StartLoc, EndLoc);
// (id)class_getSuperclass((Class)objc_getClass("CurrentClass"))
// To turn off a warning, type-cast to 'id'
InitExprs.push_back( // set 'super class', using class_getSuperclass().
NoTypeInfoCStyleCastExpr(Context,
Context->getObjCIdType(),
CK_BitCast, Cls));
// struct objc_super
QualType superType = getSuperStructType();
Expr *SuperRep;
if (LangOpts.MicrosoftExt) {
SynthSuperConstructorFunctionDecl();
// Simulate a constructor call...
DeclRefExpr *DRE = new (Context) DeclRefExpr(SuperConstructorFunctionDecl,
false, superType, VK_LValue,
SourceLocation());
SuperRep = new (Context) CallExpr(*Context, DRE, InitExprs,
superType, VK_LValue,
SourceLocation());
// The code for super is a little tricky to prevent collision with
// the structure definition in the header. The rewriter has it's own
// internal definition (__rw_objc_super) that is uses. This is why
// we need the cast below. For example:
// (struct objc_super *)&__rw_objc_super((id)self, (id)objc_getClass("SUPER"))
//
SuperRep = new (Context) UnaryOperator(SuperRep, UO_AddrOf,
Context->getPointerType(SuperRep->getType()),
VK_RValue, OK_Ordinary,
SourceLocation());
SuperRep = NoTypeInfoCStyleCastExpr(Context,
Context->getPointerType(superType),
CK_BitCast, SuperRep);
} else {
// (struct objc_super) { <exprs from above> }
InitListExpr *ILE =
new (Context) InitListExpr(*Context, SourceLocation(), InitExprs,
SourceLocation());
TypeSourceInfo *superTInfo
= Context->getTrivialTypeSourceInfo(superType);
SuperRep = new (Context) CompoundLiteralExpr(SourceLocation(), superTInfo,
superType, VK_LValue,
ILE, false);
// struct objc_super *
SuperRep = new (Context) UnaryOperator(SuperRep, UO_AddrOf,
Context->getPointerType(SuperRep->getType()),
VK_RValue, OK_Ordinary,
SourceLocation());
}
MsgExprs.push_back(SuperRep);
break;
}
case ObjCMessageExpr::Class: {
SmallVector<Expr*, 8> ClsExprs;
ObjCInterfaceDecl *Class
= Exp->getClassReceiver()->getAs<ObjCObjectType>()->getInterface();
IdentifierInfo *clsName = Class->getIdentifier();
ClsExprs.push_back(getStringLiteral(clsName->getName()));
CallExpr *Cls = SynthesizeCallToFunctionDecl(GetClassFunctionDecl,
&ClsExprs[0],
ClsExprs.size(),
StartLoc, EndLoc);
MsgExprs.push_back(Cls);
break;
}
case ObjCMessageExpr::SuperInstance:{
MsgSendFlavor = MsgSendSuperFunctionDecl;
if (MsgSendStretFlavor)
MsgSendStretFlavor = MsgSendSuperStretFunctionDecl;
assert(MsgSendFlavor && "MsgSendFlavor is NULL!");
ObjCInterfaceDecl *ClassDecl = CurMethodDef->getClassInterface();
SmallVector<Expr*, 4> InitExprs;
InitExprs.push_back(
NoTypeInfoCStyleCastExpr(Context, Context->getObjCIdType(),
CK_BitCast,
new (Context) DeclRefExpr(CurMethodDef->getSelfDecl(),
false,
Context->getObjCIdType(),
VK_RValue, SourceLocation()))
); // set the 'receiver'.
// (id)class_getSuperclass((Class)objc_getClass("CurrentClass"))
SmallVector<Expr*, 8> ClsExprs;
ClsExprs.push_back(getStringLiteral(ClassDecl->getIdentifier()->getName()));
CallExpr *Cls = SynthesizeCallToFunctionDecl(GetClassFunctionDecl,
&ClsExprs[0],
ClsExprs.size(),
StartLoc, EndLoc);
// (Class)objc_getClass("CurrentClass")
CastExpr *ArgExpr = NoTypeInfoCStyleCastExpr(Context,
Context->getObjCClassType(),
CK_BitCast, Cls);
ClsExprs.clear();
ClsExprs.push_back(ArgExpr);
Cls = SynthesizeCallToFunctionDecl(GetSuperClassFunctionDecl,
&ClsExprs[0], ClsExprs.size(),
StartLoc, EndLoc);
// (id)class_getSuperclass((Class)objc_getClass("CurrentClass"))
// To turn off a warning, type-cast to 'id'
InitExprs.push_back(
// set 'super class', using class_getSuperclass().
NoTypeInfoCStyleCastExpr(Context, Context->getObjCIdType(),
CK_BitCast, Cls));
// struct objc_super
QualType superType = getSuperStructType();
Expr *SuperRep;
if (LangOpts.MicrosoftExt) {
SynthSuperConstructorFunctionDecl();
// Simulate a constructor call...
DeclRefExpr *DRE = new (Context) DeclRefExpr(SuperConstructorFunctionDecl,
false, superType, VK_LValue,
SourceLocation());
SuperRep = new (Context) CallExpr(*Context, DRE, InitExprs,
superType, VK_LValue, SourceLocation());
// The code for super is a little tricky to prevent collision with
// the structure definition in the header. The rewriter has it's own
// internal definition (__rw_objc_super) that is uses. This is why
// we need the cast below. For example:
// (struct objc_super *)&__rw_objc_super((id)self, (id)objc_getClass("SUPER"))
//
SuperRep = new (Context) UnaryOperator(SuperRep, UO_AddrOf,
Context->getPointerType(SuperRep->getType()),
VK_RValue, OK_Ordinary,
SourceLocation());
SuperRep = NoTypeInfoCStyleCastExpr(Context,
Context->getPointerType(superType),
CK_BitCast, SuperRep);
} else {
// (struct objc_super) { <exprs from above> }
InitListExpr *ILE =
new (Context) InitListExpr(*Context, SourceLocation(), InitExprs,
SourceLocation());
TypeSourceInfo *superTInfo
= Context->getTrivialTypeSourceInfo(superType);
SuperRep = new (Context) CompoundLiteralExpr(SourceLocation(), superTInfo,
superType, VK_RValue, ILE,
false);
}
MsgExprs.push_back(SuperRep);
break;
}
case ObjCMessageExpr::Instance: {
// Remove all type-casts because it may contain objc-style types; e.g.
// Foo<Proto> *.
Expr *recExpr = Exp->getInstanceReceiver();
while (CStyleCastExpr *CE = dyn_cast<CStyleCastExpr>(recExpr))
recExpr = CE->getSubExpr();
CastKind CK = recExpr->getType()->isObjCObjectPointerType()
? CK_BitCast : recExpr->getType()->isBlockPointerType()
? CK_BlockPointerToObjCPointerCast
: CK_CPointerToObjCPointerCast;
recExpr = NoTypeInfoCStyleCastExpr(Context, Context->getObjCIdType(),
CK, recExpr);
MsgExprs.push_back(recExpr);
break;
}
}
// Create a call to sel_registerName("selName"), it will be the 2nd argument.
SmallVector<Expr*, 8> SelExprs;
SelExprs.push_back(getStringLiteral(Exp->getSelector().getAsString()));
CallExpr *SelExp = SynthesizeCallToFunctionDecl(SelGetUidFunctionDecl,
&SelExprs[0], SelExprs.size(),
StartLoc,
EndLoc);
MsgExprs.push_back(SelExp);
// Now push any user supplied arguments.
for (unsigned i = 0; i < Exp->getNumArgs(); i++) {
Expr *userExpr = Exp->getArg(i);
// Make all implicit casts explicit...ICE comes in handy:-)
if (ImplicitCastExpr *ICE = dyn_cast<ImplicitCastExpr>(userExpr)) {
// Reuse the ICE type, it is exactly what the doctor ordered.
QualType type = ICE->getType();
if (needToScanForQualifiers(type))
type = Context->getObjCIdType();
// Make sure we convert "type (^)(...)" to "type (*)(...)".
(void)convertBlockPointerToFunctionPointer(type);
const Expr *SubExpr = ICE->IgnoreParenImpCasts();
CastKind CK;
if (SubExpr->getType()->isIntegralType(*Context) &&
type->isBooleanType()) {
CK = CK_IntegralToBoolean;
} else if (type->isObjCObjectPointerType()) {
if (SubExpr->getType()->isBlockPointerType()) {
CK = CK_BlockPointerToObjCPointerCast;
} else if (SubExpr->getType()->isPointerType()) {
CK = CK_CPointerToObjCPointerCast;
} else {
CK = CK_BitCast;
}
} else {
CK = CK_BitCast;
}
userExpr = NoTypeInfoCStyleCastExpr(Context, type, CK, userExpr);
}
// Make id<P...> cast into an 'id' cast.
else if (CStyleCastExpr *CE = dyn_cast<CStyleCastExpr>(userExpr)) {
if (CE->getType()->isObjCQualifiedIdType()) {
while ((CE = dyn_cast<CStyleCastExpr>(userExpr)))
userExpr = CE->getSubExpr();
CastKind CK;
if (userExpr->getType()->isIntegralType(*Context)) {
CK = CK_IntegralToPointer;
} else if (userExpr->getType()->isBlockPointerType()) {
CK = CK_BlockPointerToObjCPointerCast;
} else if (userExpr->getType()->isPointerType()) {
CK = CK_CPointerToObjCPointerCast;
} else {
CK = CK_BitCast;
}
userExpr = NoTypeInfoCStyleCastExpr(Context, Context->getObjCIdType(),
CK, userExpr);
}
}
MsgExprs.push_back(userExpr);
// We've transferred the ownership to MsgExprs. For now, we *don't* null
// out the argument in the original expression (since we aren't deleting
// the ObjCMessageExpr). See RewritePropertyOrImplicitSetter() usage for more info.
//Exp->setArg(i, 0);
}
// Generate the funky cast.
CastExpr *cast;
SmallVector<QualType, 8> ArgTypes;
QualType returnType;
// Push 'id' and 'SEL', the 2 implicit arguments.
if (MsgSendFlavor == MsgSendSuperFunctionDecl)
ArgTypes.push_back(Context->getPointerType(getSuperStructType()));
else
ArgTypes.push_back(Context->getObjCIdType());
ArgTypes.push_back(Context->getObjCSelType());
if (ObjCMethodDecl *OMD = Exp->getMethodDecl()) {
// Push any user argument types.
for (const auto *PI : OMD->params()) {
QualType t = PI->getType()->isObjCQualifiedIdType()
? Context->getObjCIdType()
: PI->getType();
// Make sure we convert "t (^)(...)" to "t (*)(...)".
(void)convertBlockPointerToFunctionPointer(t);
ArgTypes.push_back(t);
}
returnType = Exp->getType();
convertToUnqualifiedObjCType(returnType);
(void)convertBlockPointerToFunctionPointer(returnType);
} else {
returnType = Context->getObjCIdType();
}
// Get the type, we will need to reference it in a couple spots.
QualType msgSendType = MsgSendFlavor->getType();
// Create a reference to the objc_msgSend() declaration.
DeclRefExpr *DRE = new (Context) DeclRefExpr(MsgSendFlavor, false, msgSendType,
VK_LValue, SourceLocation());
// Need to cast objc_msgSend to "void *" (to workaround a GCC bandaid).
// If we don't do this cast, we get the following bizarre warning/note:
// xx.m:13: warning: function called through a non-compatible type
// xx.m:13: note: if this code is reached, the program will abort
cast = NoTypeInfoCStyleCastExpr(Context,
Context->getPointerType(Context->VoidTy),
CK_BitCast, DRE);
// Now do the "normal" pointer to function cast.
// If we don't have a method decl, force a variadic cast.
const ObjCMethodDecl *MD = Exp->getMethodDecl();
QualType castType =
getSimpleFunctionType(returnType, ArgTypes, MD ? MD->isVariadic() : true);
castType = Context->getPointerType(castType);
cast = NoTypeInfoCStyleCastExpr(Context, castType, CK_BitCast,
cast);
// Don't forget the parens to enforce the proper binding.
ParenExpr *PE = new (Context) ParenExpr(StartLoc, EndLoc, cast);
const FunctionType *FT = msgSendType->getAs<FunctionType>();
CallExpr *CE = new (Context)
CallExpr(*Context, PE, MsgExprs, FT->getReturnType(), VK_RValue, EndLoc);
Stmt *ReplacingStmt = CE;
if (MsgSendStretFlavor) {
// We have the method which returns a struct/union. Must also generate
// call to objc_msgSend_stret and hang both varieties on a conditional
// expression which dictate which one to envoke depending on size of
// method's return type.
CallExpr *STCE = SynthMsgSendStretCallExpr(MsgSendStretFlavor,
msgSendType, returnType,
ArgTypes, MsgExprs,
Exp->getMethodDecl());
// Build sizeof(returnType)
UnaryExprOrTypeTraitExpr *sizeofExpr =
new (Context) UnaryExprOrTypeTraitExpr(UETT_SizeOf,
Context->getTrivialTypeSourceInfo(returnType),
Context->getSizeType(), SourceLocation(),
SourceLocation());
// (sizeof(returnType) <= 8 ? objc_msgSend(...) : objc_msgSend_stret(...))
// FIXME: Value of 8 is base on ppc32/x86 ABI for the most common cases.
// For X86 it is more complicated and some kind of target specific routine
// is needed to decide what to do.
unsigned IntSize =
static_cast<unsigned>(Context->getTypeSize(Context->IntTy));
IntegerLiteral *limit = IntegerLiteral::Create(*Context,
llvm::APInt(IntSize, 8),
Context->IntTy,
SourceLocation());
BinaryOperator *lessThanExpr =
new (Context) BinaryOperator(sizeofExpr, limit, BO_LE, Context->IntTy,
VK_RValue, OK_Ordinary, SourceLocation(),
false);
// (sizeof(returnType) <= 8 ? objc_msgSend(...) : objc_msgSend_stret(...))
ConditionalOperator *CondExpr =
new (Context) ConditionalOperator(lessThanExpr,
SourceLocation(), CE,
SourceLocation(), STCE,
returnType, VK_RValue, OK_Ordinary);
ReplacingStmt = new (Context) ParenExpr(SourceLocation(), SourceLocation(),
CondExpr);
}
// delete Exp; leak for now, see RewritePropertyOrImplicitSetter() usage for more info.
return ReplacingStmt;
}
Stmt *RewriteObjC::RewriteMessageExpr(ObjCMessageExpr *Exp) {
Stmt *ReplacingStmt = SynthMessageExpr(Exp, Exp->getLocStart(),
Exp->getLocEnd());
// Now do the actual rewrite.
ReplaceStmt(Exp, ReplacingStmt);
// delete Exp; leak for now, see RewritePropertyOrImplicitSetter() usage for more info.
return ReplacingStmt;
}
// typedef struct objc_object Protocol;
QualType RewriteObjC::getProtocolType() {
if (!ProtocolTypeDecl) {
TypeSourceInfo *TInfo
= Context->getTrivialTypeSourceInfo(Context->getObjCIdType());
ProtocolTypeDecl = TypedefDecl::Create(*Context, TUDecl,
SourceLocation(), SourceLocation(),
&Context->Idents.get("Protocol"),
TInfo);
}
return Context->getTypeDeclType(ProtocolTypeDecl);
}
/// RewriteObjCProtocolExpr - Rewrite a protocol expression into
/// a synthesized/forward data reference (to the protocol's metadata).
/// The forward references (and metadata) are generated in
/// RewriteObjC::HandleTranslationUnit().
Stmt *RewriteObjC::RewriteObjCProtocolExpr(ObjCProtocolExpr *Exp) {
std::string Name = "_OBJC_PROTOCOL_" + Exp->getProtocol()->getNameAsString();
IdentifierInfo *ID = &Context->Idents.get(Name);
VarDecl *VD = VarDecl::Create(*Context, TUDecl, SourceLocation(),
SourceLocation(), ID, getProtocolType(),
nullptr, SC_Extern);
DeclRefExpr *DRE = new (Context) DeclRefExpr(VD, false, getProtocolType(),
VK_LValue, SourceLocation());
Expr *DerefExpr = new (Context) UnaryOperator(DRE, UO_AddrOf,
Context->getPointerType(DRE->getType()),
VK_RValue, OK_Ordinary, SourceLocation());
CastExpr *castExpr = NoTypeInfoCStyleCastExpr(Context, DerefExpr->getType(),
CK_BitCast,
DerefExpr);
ReplaceStmt(Exp, castExpr);
ProtocolExprDecls.insert(Exp->getProtocol()->getCanonicalDecl());
// delete Exp; leak for now, see RewritePropertyOrImplicitSetter() usage for more info.
return castExpr;
}
bool RewriteObjC::BufferContainsPPDirectives(const char *startBuf,
const char *endBuf) {
while (startBuf < endBuf) {
if (*startBuf == '#') {
// Skip whitespace.
for (++startBuf; startBuf[0] == ' ' || startBuf[0] == '\t'; ++startBuf)
;
if (!strncmp(startBuf, "if", strlen("if")) ||
!strncmp(startBuf, "ifdef", strlen("ifdef")) ||
!strncmp(startBuf, "ifndef", strlen("ifndef")) ||
!strncmp(startBuf, "define", strlen("define")) ||
!strncmp(startBuf, "undef", strlen("undef")) ||
!strncmp(startBuf, "else", strlen("else")) ||
!strncmp(startBuf, "elif", strlen("elif")) ||
!strncmp(startBuf, "endif", strlen("endif")) ||
!strncmp(startBuf, "pragma", strlen("pragma")) ||
!strncmp(startBuf, "include", strlen("include")) ||
!strncmp(startBuf, "import", strlen("import")) ||
!strncmp(startBuf, "include_next", strlen("include_next")))
return true;
}
startBuf++;
}
return false;
}
/// RewriteObjCInternalStruct - Rewrite one internal struct corresponding to
/// an objective-c class with ivars.
void RewriteObjC::RewriteObjCInternalStruct(ObjCInterfaceDecl *CDecl,
std::string &Result) {
assert(CDecl && "Class missing in SynthesizeObjCInternalStruct");
assert(CDecl->getName() != "" &&
"Name missing in SynthesizeObjCInternalStruct");
// Do not synthesize more than once.
if (ObjCSynthesizedStructs.count(CDecl))
return;
ObjCInterfaceDecl *RCDecl = CDecl->getSuperClass();
int NumIvars = CDecl->ivar_size();
SourceLocation LocStart = CDecl->getLocStart();
SourceLocation LocEnd = CDecl->getEndOfDefinitionLoc();
const char *startBuf = SM->getCharacterData(LocStart);
const char *endBuf = SM->getCharacterData(LocEnd);
// If no ivars and no root or if its root, directly or indirectly,
// have no ivars (thus not synthesized) then no need to synthesize this class.
if ((!CDecl->isThisDeclarationADefinition() || NumIvars == 0) &&
(!RCDecl || !ObjCSynthesizedStructs.count(RCDecl))) {
endBuf += Lexer::MeasureTokenLength(LocEnd, *SM, LangOpts);
ReplaceText(LocStart, endBuf-startBuf, Result);
return;
}
// FIXME: This has potential of causing problem. If
// SynthesizeObjCInternalStruct is ever called recursively.
Result += "\nstruct ";
Result += CDecl->getNameAsString();
if (LangOpts.MicrosoftExt)
Result += "_IMPL";
if (NumIvars > 0) {
const char *cursor = strchr(startBuf, '{');
assert((cursor && endBuf)
&& "SynthesizeObjCInternalStruct - malformed @interface");
// If the buffer contains preprocessor directives, we do more fine-grained
// rewrites. This is intended to fix code that looks like (which occurs in
// NSURL.h, for example):
//
// #ifdef XYZ
// @interface Foo : NSObject
// #else
// @interface FooBar : NSObject
// #endif
// {
// int i;
// }
// @end
//
// This clause is segregated to avoid breaking the common case.
if (BufferContainsPPDirectives(startBuf, cursor)) {
SourceLocation L = RCDecl ? CDecl->getSuperClassLoc() :
CDecl->getAtStartLoc();
const char *endHeader = SM->getCharacterData(L);
endHeader += Lexer::MeasureTokenLength(L, *SM, LangOpts);
if (CDecl->protocol_begin() != CDecl->protocol_end()) {
// advance to the end of the referenced protocols.
while (endHeader < cursor && *endHeader != '>') endHeader++;
endHeader++;
}
// rewrite the original header
ReplaceText(LocStart, endHeader-startBuf, Result);
} else {
// rewrite the original header *without* disturbing the '{'
ReplaceText(LocStart, cursor-startBuf, Result);
}
if (RCDecl && ObjCSynthesizedStructs.count(RCDecl)) {
Result = "\n struct ";
Result += RCDecl->getNameAsString();
Result += "_IMPL ";
Result += RCDecl->getNameAsString();
Result += "_IVARS;\n";
// insert the super class structure definition.
SourceLocation OnePastCurly =
LocStart.getLocWithOffset(cursor-startBuf+1);
InsertText(OnePastCurly, Result);
}
cursor++; // past '{'
// Now comment out any visibility specifiers.
while (cursor < endBuf) {
if (*cursor == '@') {
SourceLocation atLoc = LocStart.getLocWithOffset(cursor-startBuf);
// Skip whitespace.
for (++cursor; cursor[0] == ' ' || cursor[0] == '\t'; ++cursor)
/*scan*/;
// FIXME: presence of @public, etc. inside comment results in
// this transformation as well, which is still correct c-code.
if (!strncmp(cursor, "public", strlen("public")) ||
!strncmp(cursor, "private", strlen("private")) ||
!strncmp(cursor, "package", strlen("package")) ||
!strncmp(cursor, "protected", strlen("protected")))
InsertText(atLoc, "// ");
}
// FIXME: If there are cases where '<' is used in ivar declaration part
// of user code, then scan the ivar list and use needToScanForQualifiers
// for type checking.
else if (*cursor == '<') {
SourceLocation atLoc = LocStart.getLocWithOffset(cursor-startBuf);
InsertText(atLoc, "/* ");
cursor = strchr(cursor, '>');
cursor++;
atLoc = LocStart.getLocWithOffset(cursor-startBuf);
InsertText(atLoc, " */");
} else if (*cursor == '^') { // rewrite block specifier.
SourceLocation caretLoc = LocStart.getLocWithOffset(cursor-startBuf);
ReplaceText(caretLoc, 1, "*");
}
cursor++;
}
// Don't forget to add a ';'!!
InsertText(LocEnd.getLocWithOffset(1), ";");
} else { // we don't have any instance variables - insert super struct.
endBuf += Lexer::MeasureTokenLength(LocEnd, *SM, LangOpts);
Result += " {\n struct ";
Result += RCDecl->getNameAsString();
Result += "_IMPL ";
Result += RCDecl->getNameAsString();
Result += "_IVARS;\n};\n";
ReplaceText(LocStart, endBuf-startBuf, Result);
}
// Mark this struct as having been generated.
if (!ObjCSynthesizedStructs.insert(CDecl).second)
llvm_unreachable("struct already synthesize- SynthesizeObjCInternalStruct");
}
//===----------------------------------------------------------------------===//
// Meta Data Emission
//===----------------------------------------------------------------------===//
/// RewriteImplementations - This routine rewrites all method implementations
/// and emits meta-data.
void RewriteObjC::RewriteImplementations() {
int ClsDefCount = ClassImplementation.size();
int CatDefCount = CategoryImplementation.size();
// Rewrite implemented methods
for (int i = 0; i < ClsDefCount; i++)
RewriteImplementationDecl(ClassImplementation[i]);
for (int i = 0; i < CatDefCount; i++)
RewriteImplementationDecl(CategoryImplementation[i]);
}
void RewriteObjC::RewriteByRefString(std::string &ResultStr,
const std::string &Name,
ValueDecl *VD, bool def) {
assert(BlockByRefDeclNo.count(VD) &&
"RewriteByRefString: ByRef decl missing");
if (def)
ResultStr += "struct ";
ResultStr += "__Block_byref_" + Name +
"_" + utostr(BlockByRefDeclNo[VD]) ;
}
static bool HasLocalVariableExternalStorage(ValueDecl *VD) {
if (VarDecl *Var = dyn_cast<VarDecl>(VD))
return (Var->isFunctionOrMethodVarDecl() && !Var->hasLocalStorage());
return false;
}
std::string RewriteObjC::SynthesizeBlockFunc(BlockExpr *CE, int i,
StringRef funcName,
std::string Tag) {
const FunctionType *AFT = CE->getFunctionType();
QualType RT = AFT->getReturnType();
std::string StructRef = "struct " + Tag;
std::string S = "static " + RT.getAsString(Context->getPrintingPolicy()) + " __" +
funcName.str() + "_" + "block_func_" + utostr(i);
BlockDecl *BD = CE->getBlockDecl();
if (isa<FunctionNoProtoType>(AFT)) {
// No user-supplied arguments. Still need to pass in a pointer to the
// block (to reference imported block decl refs).
S += "(" + StructRef + " *__cself)";
} else if (BD->param_empty()) {
S += "(" + StructRef + " *__cself)";
} else {
const FunctionProtoType *FT = cast<FunctionProtoType>(AFT);
assert(FT && "SynthesizeBlockFunc: No function proto");
S += '(';
// first add the implicit argument.
S += StructRef + " *__cself, ";
std::string ParamStr;
for (BlockDecl::param_iterator AI = BD->param_begin(),
E = BD->param_end(); AI != E; ++AI) {
if (AI != BD->param_begin()) S += ", ";
ParamStr = (*AI)->getNameAsString();
QualType QT = (*AI)->getType();
(void)convertBlockPointerToFunctionPointer(QT);
QT.getAsStringInternal(ParamStr, Context->getPrintingPolicy());
S += ParamStr;
}
if (FT->isVariadic()) {
if (!BD->param_empty()) S += ", ";
S += "...";
}
S += ')';
}
S += " {\n";
// Create local declarations to avoid rewriting all closure decl ref exprs.
// First, emit a declaration for all "by ref" decls.
for (SmallVectorImpl<ValueDecl *>::iterator I = BlockByRefDecls.begin(),
E = BlockByRefDecls.end(); I != E; ++I) {
S += " ";
std::string Name = (*I)->getNameAsString();
std::string TypeString;
RewriteByRefString(TypeString, Name, (*I));
TypeString += " *";
Name = TypeString + Name;
S += Name + " = __cself->" + (*I)->getNameAsString() + "; // bound by ref\n";
}
// Next, emit a declaration for all "by copy" declarations.
for (SmallVectorImpl<ValueDecl *>::iterator I = BlockByCopyDecls.begin(),
E = BlockByCopyDecls.end(); I != E; ++I) {
S += " ";
// Handle nested closure invocation. For example:
//
// void (^myImportedClosure)(void);
// myImportedClosure = ^(void) { setGlobalInt(x + y); };
//
// void (^anotherClosure)(void);
// anotherClosure = ^(void) {
// myImportedClosure(); // import and invoke the closure
// };
//
if (isTopLevelBlockPointerType((*I)->getType())) {
RewriteBlockPointerTypeVariable(S, (*I));
S += " = (";
RewriteBlockPointerType(S, (*I)->getType());
S += ")";
S += "__cself->" + (*I)->getNameAsString() + "; // bound by copy\n";
}
else {
std::string Name = (*I)->getNameAsString();
QualType QT = (*I)->getType();
if (HasLocalVariableExternalStorage(*I))
QT = Context->getPointerType(QT);
QT.getAsStringInternal(Name, Context->getPrintingPolicy());
S += Name + " = __cself->" +
(*I)->getNameAsString() + "; // bound by copy\n";
}
}
std::string RewrittenStr = RewrittenBlockExprs[CE];
const char *cstr = RewrittenStr.c_str();
while (*cstr++ != '{') ;
S += cstr;
S += "\n";
return S;
}
std::string RewriteObjC::SynthesizeBlockHelperFuncs(BlockExpr *CE, int i,
StringRef funcName,
std::string Tag) {
std::string StructRef = "struct " + Tag;
std::string S = "static void __";
S += funcName;
S += "_block_copy_" + utostr(i);
S += "(" + StructRef;
S += "*dst, " + StructRef;
S += "*src) {";
for (ValueDecl *VD : ImportedBlockDecls) {
S += "_Block_object_assign((void*)&dst->";
S += VD->getNameAsString();
S += ", (void*)src->";
S += VD->getNameAsString();
if (BlockByRefDeclsPtrSet.count(VD))
S += ", " + utostr(BLOCK_FIELD_IS_BYREF) + "/*BLOCK_FIELD_IS_BYREF*/);";
else if (VD->getType()->isBlockPointerType())
S += ", " + utostr(BLOCK_FIELD_IS_BLOCK) + "/*BLOCK_FIELD_IS_BLOCK*/);";
else
S += ", " + utostr(BLOCK_FIELD_IS_OBJECT) + "/*BLOCK_FIELD_IS_OBJECT*/);";
}
S += "}\n";
S += "\nstatic void __";
S += funcName;
S += "_block_dispose_" + utostr(i);
S += "(" + StructRef;
S += "*src) {";
for (ValueDecl *VD : ImportedBlockDecls) {
S += "_Block_object_dispose((void*)src->";
S += VD->getNameAsString();
if (BlockByRefDeclsPtrSet.count(VD))
S += ", " + utostr(BLOCK_FIELD_IS_BYREF) + "/*BLOCK_FIELD_IS_BYREF*/);";
else if (VD->getType()->isBlockPointerType())
S += ", " + utostr(BLOCK_FIELD_IS_BLOCK) + "/*BLOCK_FIELD_IS_BLOCK*/);";
else
S += ", " + utostr(BLOCK_FIELD_IS_OBJECT) + "/*BLOCK_FIELD_IS_OBJECT*/);";
}
S += "}\n";
return S;
}
std::string RewriteObjC::SynthesizeBlockImpl(BlockExpr *CE, std::string Tag,
std::string Desc) {
std::string S = "\nstruct " + Tag;
std::string Constructor = " " + Tag;
S += " {\n struct __block_impl impl;\n";
S += " struct " + Desc;
S += "* Desc;\n";
Constructor += "(void *fp, "; // Invoke function pointer.
Constructor += "struct " + Desc; // Descriptor pointer.
Constructor += " *desc";
if (BlockDeclRefs.size()) {
// Output all "by copy" declarations.
for (SmallVectorImpl<ValueDecl *>::iterator I = BlockByCopyDecls.begin(),
E = BlockByCopyDecls.end(); I != E; ++I) {
S += " ";
std::string FieldName = (*I)->getNameAsString();
std::string ArgName = "_" + FieldName;
// Handle nested closure invocation. For example:
//
// void (^myImportedBlock)(void);
// myImportedBlock = ^(void) { setGlobalInt(x + y); };
//
// void (^anotherBlock)(void);
// anotherBlock = ^(void) {
// myImportedBlock(); // import and invoke the closure
// };
//
if (isTopLevelBlockPointerType((*I)->getType())) {
S += "struct __block_impl *";
Constructor += ", void *" + ArgName;
} else {
QualType QT = (*I)->getType();
if (HasLocalVariableExternalStorage(*I))
QT = Context->getPointerType(QT);
QT.getAsStringInternal(FieldName, Context->getPrintingPolicy());
QT.getAsStringInternal(ArgName, Context->getPrintingPolicy());
Constructor += ", " + ArgName;
}
S += FieldName + ";\n";
}
// Output all "by ref" declarations.
for (SmallVectorImpl<ValueDecl *>::iterator I = BlockByRefDecls.begin(),
E = BlockByRefDecls.end(); I != E; ++I) {
S += " ";
std::string FieldName = (*I)->getNameAsString();
std::string ArgName = "_" + FieldName;
{
std::string TypeString;
RewriteByRefString(TypeString, FieldName, (*I));
TypeString += " *";
FieldName = TypeString + FieldName;
ArgName = TypeString + ArgName;
Constructor += ", " + ArgName;
}
S += FieldName + "; // by ref\n";
}
// Finish writing the constructor.
Constructor += ", int flags=0)";
// Initialize all "by copy" arguments.
bool firsTime = true;
for (SmallVectorImpl<ValueDecl *>::iterator I = BlockByCopyDecls.begin(),
E = BlockByCopyDecls.end(); I != E; ++I) {
std::string Name = (*I)->getNameAsString();
if (firsTime) {
Constructor += " : ";
firsTime = false;
}
else
Constructor += ", ";
if (isTopLevelBlockPointerType((*I)->getType()))
Constructor += Name + "((struct __block_impl *)_" + Name + ")";
else
Constructor += Name + "(_" + Name + ")";
}
// Initialize all "by ref" arguments.
for (SmallVectorImpl<ValueDecl *>::iterator I = BlockByRefDecls.begin(),
E = BlockByRefDecls.end(); I != E; ++I) {
std::string Name = (*I)->getNameAsString();
if (firsTime) {
Constructor += " : ";
firsTime = false;
}
else
Constructor += ", ";
Constructor += Name + "(_" + Name + "->__forwarding)";
}
Constructor += " {\n";
if (GlobalVarDecl)
Constructor += " impl.isa = &_NSConcreteGlobalBlock;\n";
else
Constructor += " impl.isa = &_NSConcreteStackBlock;\n";
Constructor += " impl.Flags = flags;\n impl.FuncPtr = fp;\n";
Constructor += " Desc = desc;\n";
} else {
// Finish writing the constructor.
Constructor += ", int flags=0) {\n";
if (GlobalVarDecl)
Constructor += " impl.isa = &_NSConcreteGlobalBlock;\n";
else
Constructor += " impl.isa = &_NSConcreteStackBlock;\n";
Constructor += " impl.Flags = flags;\n impl.FuncPtr = fp;\n";
Constructor += " Desc = desc;\n";
}
Constructor += " ";
Constructor += "}\n";
S += Constructor;
S += "};\n";
return S;
}
std::string RewriteObjC::SynthesizeBlockDescriptor(std::string DescTag,
std::string ImplTag, int i,
StringRef FunName,
unsigned hasCopy) {
std::string S = "\nstatic struct " + DescTag;
S += " {\n unsigned long reserved;\n";
S += " unsigned long Block_size;\n";
if (hasCopy) {
S += " void (*copy)(struct ";
S += ImplTag; S += "*, struct ";
S += ImplTag; S += "*);\n";
S += " void (*dispose)(struct ";
S += ImplTag; S += "*);\n";
}
S += "} ";
S += DescTag + "_DATA = { 0, sizeof(struct ";
S += ImplTag + ")";
if (hasCopy) {
S += ", __" + FunName.str() + "_block_copy_" + utostr(i);
S += ", __" + FunName.str() + "_block_dispose_" + utostr(i);
}
S += "};\n";
return S;
}
void RewriteObjC::SynthesizeBlockLiterals(SourceLocation FunLocStart,
StringRef FunName) {
// Insert declaration for the function in which block literal is used.
if (CurFunctionDeclToDeclareForBlock && !Blocks.empty())
RewriteBlockLiteralFunctionDecl(CurFunctionDeclToDeclareForBlock);
bool RewriteSC = (GlobalVarDecl &&
!Blocks.empty() &&
GlobalVarDecl->getStorageClass() == SC_Static &&
GlobalVarDecl->getType().getCVRQualifiers());
if (RewriteSC) {
std::string SC(" void __");
SC += GlobalVarDecl->getNameAsString();
SC += "() {}";
InsertText(FunLocStart, SC);
}
// Insert closures that were part of the function.
for (unsigned i = 0, count=0; i < Blocks.size(); i++) {
CollectBlockDeclRefInfo(Blocks[i]);
// Need to copy-in the inner copied-in variables not actually used in this
// block.
for (int j = 0; j < InnerDeclRefsCount[i]; j++) {
DeclRefExpr *Exp = InnerDeclRefs[count++];
ValueDecl *VD = Exp->getDecl();
BlockDeclRefs.push_back(Exp);
if (!VD->hasAttr<BlocksAttr>() && !BlockByCopyDeclsPtrSet.count(VD)) {
BlockByCopyDeclsPtrSet.insert(VD);
BlockByCopyDecls.push_back(VD);
}
if (VD->hasAttr<BlocksAttr>() && !BlockByRefDeclsPtrSet.count(VD)) {
BlockByRefDeclsPtrSet.insert(VD);
BlockByRefDecls.push_back(VD);
}
// imported objects in the inner blocks not used in the outer
// blocks must be copied/disposed in the outer block as well.
if (VD->hasAttr<BlocksAttr>() ||
VD->getType()->isObjCObjectPointerType() ||
VD->getType()->isBlockPointerType())
ImportedBlockDecls.insert(VD);
}
std::string ImplTag = "__" + FunName.str() + "_block_impl_" + utostr(i);
std::string DescTag = "__" + FunName.str() + "_block_desc_" + utostr(i);
std::string CI = SynthesizeBlockImpl(Blocks[i], ImplTag, DescTag);
InsertText(FunLocStart, CI);
std::string CF = SynthesizeBlockFunc(Blocks[i], i, FunName, ImplTag);
InsertText(FunLocStart, CF);
if (ImportedBlockDecls.size()) {
std::string HF = SynthesizeBlockHelperFuncs(Blocks[i], i, FunName, ImplTag);
InsertText(FunLocStart, HF);
}
std::string BD = SynthesizeBlockDescriptor(DescTag, ImplTag, i, FunName,
ImportedBlockDecls.size() > 0);
InsertText(FunLocStart, BD);
BlockDeclRefs.clear();
BlockByRefDecls.clear();
BlockByRefDeclsPtrSet.clear();
BlockByCopyDecls.clear();
BlockByCopyDeclsPtrSet.clear();
ImportedBlockDecls.clear();
}
if (RewriteSC) {
// Must insert any 'const/volatile/static here. Since it has been
// removed as result of rewriting of block literals.
std::string SC;
if (GlobalVarDecl->getStorageClass() == SC_Static)
SC = "static ";
if (GlobalVarDecl->getType().isConstQualified())
SC += "const ";
if (GlobalVarDecl->getType().isVolatileQualified())
SC += "volatile ";
if (GlobalVarDecl->getType().isRestrictQualified())
SC += "restrict ";
InsertText(FunLocStart, SC);
}
Blocks.clear();
InnerDeclRefsCount.clear();
InnerDeclRefs.clear();
RewrittenBlockExprs.clear();
}
void RewriteObjC::InsertBlockLiteralsWithinFunction(FunctionDecl *FD) {
SourceLocation FunLocStart = FD->getTypeSpecStartLoc();
StringRef FuncName = FD->getName();
SynthesizeBlockLiterals(FunLocStart, FuncName);
}
static void BuildUniqueMethodName(std::string &Name,
ObjCMethodDecl *MD) {
ObjCInterfaceDecl *IFace = MD->getClassInterface();
Name = IFace->getName();
Name += "__" + MD->getSelector().getAsString();
// Convert colons to underscores.
std::string::size_type loc = 0;
while ((loc = Name.find(":", loc)) != std::string::npos)
Name.replace(loc, 1, "_");
}
void RewriteObjC::InsertBlockLiteralsWithinMethod(ObjCMethodDecl *MD) {
//fprintf(stderr,"In InsertBlockLiteralsWitinMethod\n");
//SourceLocation FunLocStart = MD->getLocStart();
SourceLocation FunLocStart = MD->getLocStart();
std::string FuncName;
BuildUniqueMethodName(FuncName, MD);
SynthesizeBlockLiterals(FunLocStart, FuncName);
}
void RewriteObjC::GetBlockDeclRefExprs(Stmt *S) {
for (Stmt::child_range CI = S->children(); CI; ++CI)
if (*CI) {
if (BlockExpr *CBE = dyn_cast<BlockExpr>(*CI))
GetBlockDeclRefExprs(CBE->getBody());
else
GetBlockDeclRefExprs(*CI);
}
// Handle specific things.
if (DeclRefExpr *DRE = dyn_cast<DeclRefExpr>(S))
if (DRE->refersToEnclosingVariableOrCapture() ||
HasLocalVariableExternalStorage(DRE->getDecl()))
// FIXME: Handle enums.
BlockDeclRefs.push_back(DRE);
return;
}
void RewriteObjC::GetInnerBlockDeclRefExprs(Stmt *S,
SmallVectorImpl<DeclRefExpr *> &InnerBlockDeclRefs,
llvm::SmallPtrSetImpl<const DeclContext *> &InnerContexts) {
for (Stmt::child_range CI = S->children(); CI; ++CI)
if (*CI) {
if (BlockExpr *CBE = dyn_cast<BlockExpr>(*CI)) {
InnerContexts.insert(cast<DeclContext>(CBE->getBlockDecl()));
GetInnerBlockDeclRefExprs(CBE->getBody(),
InnerBlockDeclRefs,
InnerContexts);
}
else
GetInnerBlockDeclRefExprs(*CI,
InnerBlockDeclRefs,
InnerContexts);
}
// Handle specific things.
if (DeclRefExpr *DRE = dyn_cast<DeclRefExpr>(S)) {
if (DRE->refersToEnclosingVariableOrCapture() ||
HasLocalVariableExternalStorage(DRE->getDecl())) {
if (!InnerContexts.count(DRE->getDecl()->getDeclContext()))
InnerBlockDeclRefs.push_back(DRE);
if (VarDecl *Var = cast<VarDecl>(DRE->getDecl()))
if (Var->isFunctionOrMethodVarDecl())
ImportedLocalExternalDecls.insert(Var);
}
}
return;
}
/// convertFunctionTypeOfBlocks - This routine converts a function type
/// whose result type may be a block pointer or whose argument type(s)
/// might be block pointers to an equivalent function type replacing
/// all block pointers to function pointers.
QualType RewriteObjC::convertFunctionTypeOfBlocks(const FunctionType *FT) {
const FunctionProtoType *FTP = dyn_cast<FunctionProtoType>(FT);
// FTP will be null for closures that don't take arguments.
// Generate a funky cast.
SmallVector<QualType, 8> ArgTypes;
QualType Res = FT->getReturnType();
bool HasBlockType = convertBlockPointerToFunctionPointer(Res);
if (FTP) {
for (auto &I : FTP->param_types()) {
QualType t = I;
// Make sure we convert "t (^)(...)" to "t (*)(...)".
if (convertBlockPointerToFunctionPointer(t))
HasBlockType = true;
ArgTypes.push_back(t);
}
}
QualType FuncType;
// FIXME. Does this work if block takes no argument but has a return type
// which is of block type?
if (HasBlockType)
FuncType = getSimpleFunctionType(Res, ArgTypes);
else FuncType = QualType(FT, 0);
return FuncType;
}
Stmt *RewriteObjC::SynthesizeBlockCall(CallExpr *Exp, const Expr *BlockExp) {
// Navigate to relevant type information.
const BlockPointerType *CPT = nullptr;
if (const DeclRefExpr *DRE = dyn_cast<DeclRefExpr>(BlockExp)) {
CPT = DRE->getType()->getAs<BlockPointerType>();
} else if (const MemberExpr *MExpr = dyn_cast<MemberExpr>(BlockExp)) {
CPT = MExpr->getType()->getAs<BlockPointerType>();
}
else if (const ParenExpr *PRE = dyn_cast<ParenExpr>(BlockExp)) {
return SynthesizeBlockCall(Exp, PRE->getSubExpr());
}
else if (const ImplicitCastExpr *IEXPR = dyn_cast<ImplicitCastExpr>(BlockExp))
CPT = IEXPR->getType()->getAs<BlockPointerType>();
else if (const ConditionalOperator *CEXPR =
dyn_cast<ConditionalOperator>(BlockExp)) {
Expr *LHSExp = CEXPR->getLHS();
Stmt *LHSStmt = SynthesizeBlockCall(Exp, LHSExp);
Expr *RHSExp = CEXPR->getRHS();
Stmt *RHSStmt = SynthesizeBlockCall(Exp, RHSExp);
Expr *CONDExp = CEXPR->getCond();
ConditionalOperator *CondExpr =
new (Context) ConditionalOperator(CONDExp,
SourceLocation(), cast<Expr>(LHSStmt),
SourceLocation(), cast<Expr>(RHSStmt),
Exp->getType(), VK_RValue, OK_Ordinary);
return CondExpr;
} else if (const ObjCIvarRefExpr *IRE = dyn_cast<ObjCIvarRefExpr>(BlockExp)) {
CPT = IRE->getType()->getAs<BlockPointerType>();
} else if (const PseudoObjectExpr *POE
= dyn_cast<PseudoObjectExpr>(BlockExp)) {
CPT = POE->getType()->castAs<BlockPointerType>();
} else {
assert(1 && "RewriteBlockClass: Bad type");
}
assert(CPT && "RewriteBlockClass: Bad type");
const FunctionType *FT = CPT->getPointeeType()->getAs<FunctionType>();
assert(FT && "RewriteBlockClass: Bad type");
const FunctionProtoType *FTP = dyn_cast<FunctionProtoType>(FT);
// FTP will be null for closures that don't take arguments.
RecordDecl *RD = RecordDecl::Create(*Context, TTK_Struct, TUDecl,
SourceLocation(), SourceLocation(),
&Context->Idents.get("__block_impl"));
QualType PtrBlock = Context->getPointerType(Context->getTagDeclType(RD));
// Generate a funky cast.
SmallVector<QualType, 8> ArgTypes;
// Push the block argument type.
ArgTypes.push_back(PtrBlock);
if (FTP) {
for (auto &I : FTP->param_types()) {
QualType t = I;
// Make sure we convert "t (^)(...)" to "t (*)(...)".
if (!convertBlockPointerToFunctionPointer(t))
convertToUnqualifiedObjCType(t);
ArgTypes.push_back(t);
}
}
// Now do the pointer to function cast.
QualType PtrToFuncCastType = getSimpleFunctionType(Exp->getType(), ArgTypes);
PtrToFuncCastType = Context->getPointerType(PtrToFuncCastType);
CastExpr *BlkCast = NoTypeInfoCStyleCastExpr(Context, PtrBlock,
CK_BitCast,
const_cast<Expr*>(BlockExp));
// Don't forget the parens to enforce the proper binding.
ParenExpr *PE = new (Context) ParenExpr(SourceLocation(), SourceLocation(),
BlkCast);
//PE->dump();
FieldDecl *FD = FieldDecl::Create(*Context, nullptr, SourceLocation(),
SourceLocation(),
&Context->Idents.get("FuncPtr"),
Context->VoidPtrTy, nullptr,
/*BitWidth=*/nullptr, /*Mutable=*/true,
ICIS_NoInit);
MemberExpr *ME =
new (Context) MemberExpr(PE, true, SourceLocation(), FD, SourceLocation(),
FD->getType(), VK_LValue, OK_Ordinary);
CastExpr *FunkCast = NoTypeInfoCStyleCastExpr(Context, PtrToFuncCastType,
CK_BitCast, ME);
PE = new (Context) ParenExpr(SourceLocation(), SourceLocation(), FunkCast);
SmallVector<Expr*, 8> BlkExprs;
// Add the implicit argument.
BlkExprs.push_back(BlkCast);
// Add the user arguments.
for (CallExpr::arg_iterator I = Exp->arg_begin(),
E = Exp->arg_end(); I != E; ++I) {
BlkExprs.push_back(*I);
}
CallExpr *CE = new (Context) CallExpr(*Context, PE, BlkExprs,
Exp->getType(), VK_RValue,
SourceLocation());
return CE;
}
// We need to return the rewritten expression to handle cases where the
// BlockDeclRefExpr is embedded in another expression being rewritten.
// For example:
//
// int main() {
// __block Foo *f;
// __block int i;
//
// void (^myblock)() = ^() {
// [f test]; // f is a BlockDeclRefExpr embedded in a message (which is being rewritten).
// i = 77;
// };
//}
Stmt *RewriteObjC::RewriteBlockDeclRefExpr(DeclRefExpr *DeclRefExp) {
// Rewrite the byref variable into BYREFVAR->__forwarding->BYREFVAR
// for each DeclRefExp where BYREFVAR is name of the variable.
ValueDecl *VD = DeclRefExp->getDecl();
bool isArrow = DeclRefExp->refersToEnclosingVariableOrCapture() ||
HasLocalVariableExternalStorage(DeclRefExp->getDecl());
FieldDecl *FD = FieldDecl::Create(*Context, nullptr, SourceLocation(),
SourceLocation(),
&Context->Idents.get("__forwarding"),
Context->VoidPtrTy, nullptr,
/*BitWidth=*/nullptr, /*Mutable=*/true,
ICIS_NoInit);
MemberExpr *ME = new (Context)
MemberExpr(DeclRefExp, isArrow, SourceLocation(), FD, SourceLocation(),
FD->getType(), VK_LValue, OK_Ordinary);
StringRef Name = VD->getName();
FD = FieldDecl::Create(*Context, nullptr, SourceLocation(), SourceLocation(),
&Context->Idents.get(Name),
Context->VoidPtrTy, nullptr,
/*BitWidth=*/nullptr, /*Mutable=*/true,
ICIS_NoInit);
ME =
new (Context) MemberExpr(ME, true, SourceLocation(), FD, SourceLocation(),
DeclRefExp->getType(), VK_LValue, OK_Ordinary);
// Need parens to enforce precedence.
ParenExpr *PE = new (Context) ParenExpr(DeclRefExp->getExprLoc(),
DeclRefExp->getExprLoc(),
ME);
ReplaceStmt(DeclRefExp, PE);
return PE;
}
// Rewrites the imported local variable V with external storage
// (static, extern, etc.) as *V
//
Stmt *RewriteObjC::RewriteLocalVariableExternalStorage(DeclRefExpr *DRE) {
ValueDecl *VD = DRE->getDecl();
if (VarDecl *Var = dyn_cast<VarDecl>(VD))
if (!ImportedLocalExternalDecls.count(Var))
return DRE;
Expr *Exp = new (Context) UnaryOperator(DRE, UO_Deref, DRE->getType(),
VK_LValue, OK_Ordinary,
DRE->getLocation());
// Need parens to enforce precedence.
ParenExpr *PE = new (Context) ParenExpr(SourceLocation(), SourceLocation(),
Exp);
ReplaceStmt(DRE, PE);
return PE;
}
void RewriteObjC::RewriteCastExpr(CStyleCastExpr *CE) {
SourceLocation LocStart = CE->getLParenLoc();
SourceLocation LocEnd = CE->getRParenLoc();
// Need to avoid trying to rewrite synthesized casts.
if (LocStart.isInvalid())
return;
// Need to avoid trying to rewrite casts contained in macros.
if (!Rewriter::isRewritable(LocStart) || !Rewriter::isRewritable(LocEnd))
return;
const char *startBuf = SM->getCharacterData(LocStart);
const char *endBuf = SM->getCharacterData(LocEnd);
QualType QT = CE->getType();
const Type* TypePtr = QT->getAs<Type>();
if (isa<TypeOfExprType>(TypePtr)) {
const TypeOfExprType *TypeOfExprTypePtr = cast<TypeOfExprType>(TypePtr);
QT = TypeOfExprTypePtr->getUnderlyingExpr()->getType();
std::string TypeAsString = "(";
RewriteBlockPointerType(TypeAsString, QT);
TypeAsString += ")";
ReplaceText(LocStart, endBuf-startBuf+1, TypeAsString);
return;
}
// advance the location to startArgList.
const char *argPtr = startBuf;
while (*argPtr++ && (argPtr < endBuf)) {
switch (*argPtr) {
case '^':
// Replace the '^' with '*'.
LocStart = LocStart.getLocWithOffset(argPtr-startBuf);
ReplaceText(LocStart, 1, "*");
break;
}
}
return;
}
void RewriteObjC::RewriteBlockPointerFunctionArgs(FunctionDecl *FD) {
SourceLocation DeclLoc = FD->getLocation();
unsigned parenCount = 0;
// We have 1 or more arguments that have closure pointers.
const char *startBuf = SM->getCharacterData(DeclLoc);
const char *startArgList = strchr(startBuf, '(');
assert((*startArgList == '(') && "Rewriter fuzzy parser confused");
parenCount++;
// advance the location to startArgList.
DeclLoc = DeclLoc.getLocWithOffset(startArgList-startBuf);
assert((DeclLoc.isValid()) && "Invalid DeclLoc");
const char *argPtr = startArgList;
while (*argPtr++ && parenCount) {
switch (*argPtr) {
case '^':
// Replace the '^' with '*'.
DeclLoc = DeclLoc.getLocWithOffset(argPtr-startArgList);
ReplaceText(DeclLoc, 1, "*");
break;
case '(':
parenCount++;
break;
case ')':
parenCount--;
break;
}
}
return;
}
bool RewriteObjC::PointerTypeTakesAnyBlockArguments(QualType QT) {
const FunctionProtoType *FTP;
const PointerType *PT = QT->getAs<PointerType>();
if (PT) {
FTP = PT->getPointeeType()->getAs<FunctionProtoType>();
} else {
const BlockPointerType *BPT = QT->getAs<BlockPointerType>();
assert(BPT && "BlockPointerTypeTakeAnyBlockArguments(): not a block pointer type");
FTP = BPT->getPointeeType()->getAs<FunctionProtoType>();
}
if (FTP) {
for (const auto &I : FTP->param_types())
if (isTopLevelBlockPointerType(I))
return true;
}
return false;
}
bool RewriteObjC::PointerTypeTakesAnyObjCQualifiedType(QualType QT) {
const FunctionProtoType *FTP;
const PointerType *PT = QT->getAs<PointerType>();
if (PT) {
FTP = PT->getPointeeType()->getAs<FunctionProtoType>();
} else {
const BlockPointerType *BPT = QT->getAs<BlockPointerType>();
assert(BPT && "BlockPointerTypeTakeAnyBlockArguments(): not a block pointer type");
FTP = BPT->getPointeeType()->getAs<FunctionProtoType>();
}
if (FTP) {
for (const auto &I : FTP->param_types()) {
if (I->isObjCQualifiedIdType())
return true;
if (I->isObjCObjectPointerType() &&
I->getPointeeType()->isObjCQualifiedInterfaceType())
return true;
}
}
return false;
}
void RewriteObjC::GetExtentOfArgList(const char *Name, const char *&LParen,
const char *&RParen) {
const char *argPtr = strchr(Name, '(');
assert((*argPtr == '(') && "Rewriter fuzzy parser confused");
LParen = argPtr; // output the start.
argPtr++; // skip past the left paren.
unsigned parenCount = 1;
while (*argPtr && parenCount) {
switch (*argPtr) {
case '(': parenCount++; break;
case ')': parenCount--; break;
default: break;
}
if (parenCount) argPtr++;
}
assert((*argPtr == ')') && "Rewriter fuzzy parser confused");
RParen = argPtr; // output the end
}
void RewriteObjC::RewriteBlockPointerDecl(NamedDecl *ND) {
if (FunctionDecl *FD = dyn_cast<FunctionDecl>(ND)) {
RewriteBlockPointerFunctionArgs(FD);
return;
}
// Handle Variables and Typedefs.
SourceLocation DeclLoc = ND->getLocation();
QualType DeclT;
if (VarDecl *VD = dyn_cast<VarDecl>(ND))
DeclT = VD->getType();
else if (TypedefNameDecl *TDD = dyn_cast<TypedefNameDecl>(ND))
DeclT = TDD->getUnderlyingType();
else if (FieldDecl *FD = dyn_cast<FieldDecl>(ND))
DeclT = FD->getType();
else
llvm_unreachable("RewriteBlockPointerDecl(): Decl type not yet handled");
const char *startBuf = SM->getCharacterData(DeclLoc);
const char *endBuf = startBuf;
// scan backward (from the decl location) for the end of the previous decl.
while (*startBuf != '^' && *startBuf != ';' && startBuf != MainFileStart)
startBuf--;
SourceLocation Start = DeclLoc.getLocWithOffset(startBuf-endBuf);
std::string buf;
unsigned OrigLength=0;
// *startBuf != '^' if we are dealing with a pointer to function that
// may take block argument types (which will be handled below).
if (*startBuf == '^') {
// Replace the '^' with '*', computing a negative offset.
buf = '*';
startBuf++;
OrigLength++;
}
while (*startBuf != ')') {
buf += *startBuf;
startBuf++;
OrigLength++;
}
buf += ')';
OrigLength++;
if (PointerTypeTakesAnyBlockArguments(DeclT) ||
PointerTypeTakesAnyObjCQualifiedType(DeclT)) {
// Replace the '^' with '*' for arguments.
// Replace id<P> with id/*<>*/
DeclLoc = ND->getLocation();
startBuf = SM->getCharacterData(DeclLoc);
const char *argListBegin, *argListEnd;
GetExtentOfArgList(startBuf, argListBegin, argListEnd);
while (argListBegin < argListEnd) {
if (*argListBegin == '^')
buf += '*';
else if (*argListBegin == '<') {
buf += "/*";
buf += *argListBegin++;
OrigLength++;
while (*argListBegin != '>') {
buf += *argListBegin++;
OrigLength++;
}
buf += *argListBegin;
buf += "*/";
}
else
buf += *argListBegin;
argListBegin++;
OrigLength++;
}
buf += ')';
OrigLength++;
}
ReplaceText(Start, OrigLength, buf);
return;
}
/// SynthesizeByrefCopyDestroyHelper - This routine synthesizes:
/// void __Block_byref_id_object_copy(struct Block_byref_id_object *dst,
/// struct Block_byref_id_object *src) {
/// _Block_object_assign (&_dest->object, _src->object,
/// BLOCK_BYREF_CALLER | BLOCK_FIELD_IS_OBJECT
/// [|BLOCK_FIELD_IS_WEAK]) // object
/// _Block_object_assign(&_dest->object, _src->object,
/// BLOCK_BYREF_CALLER | BLOCK_FIELD_IS_BLOCK
/// [|BLOCK_FIELD_IS_WEAK]) // block
/// }
/// And:
/// void __Block_byref_id_object_dispose(struct Block_byref_id_object *_src) {
/// _Block_object_dispose(_src->object,
/// BLOCK_BYREF_CALLER | BLOCK_FIELD_IS_OBJECT
/// [|BLOCK_FIELD_IS_WEAK]) // object
/// _Block_object_dispose(_src->object,
/// BLOCK_BYREF_CALLER | BLOCK_FIELD_IS_BLOCK
/// [|BLOCK_FIELD_IS_WEAK]) // block
/// }
std::string RewriteObjC::SynthesizeByrefCopyDestroyHelper(VarDecl *VD,
int flag) {
std::string S;
if (CopyDestroyCache.count(flag))
return S;
CopyDestroyCache.insert(flag);
S = "static void __Block_byref_id_object_copy_";
S += utostr(flag);
S += "(void *dst, void *src) {\n";
// offset into the object pointer is computed as:
// void * + void* + int + int + void* + void *
unsigned IntSize =
static_cast<unsigned>(Context->getTypeSize(Context->IntTy));
unsigned VoidPtrSize =
static_cast<unsigned>(Context->getTypeSize(Context->VoidPtrTy));
unsigned offset = (VoidPtrSize*4 + IntSize + IntSize)/Context->getCharWidth();
S += " _Block_object_assign((char*)dst + ";
S += utostr(offset);
S += ", *(void * *) ((char*)src + ";
S += utostr(offset);
S += "), ";
S += utostr(flag);
S += ");\n}\n";
S += "static void __Block_byref_id_object_dispose_";
S += utostr(flag);
S += "(void *src) {\n";
S += " _Block_object_dispose(*(void * *) ((char*)src + ";
S += utostr(offset);
S += "), ";
S += utostr(flag);
S += ");\n}\n";
return S;
}
/// RewriteByRefVar - For each __block typex ND variable this routine transforms
/// the declaration into:
/// struct __Block_byref_ND {
/// void *__isa; // NULL for everything except __weak pointers
/// struct __Block_byref_ND *__forwarding;
/// int32_t __flags;
/// int32_t __size;
/// void *__Block_byref_id_object_copy; // If variable is __block ObjC object
/// void *__Block_byref_id_object_dispose; // If variable is __block ObjC object
/// typex ND;
/// };
///
/// It then replaces declaration of ND variable with:
/// struct __Block_byref_ND ND = {__isa=0B, __forwarding=&ND, __flags=some_flag,
/// __size=sizeof(struct __Block_byref_ND),
/// ND=initializer-if-any};
///
///
void RewriteObjC::RewriteByRefVar(VarDecl *ND) {
// Insert declaration for the function in which block literal is
// used.
if (CurFunctionDeclToDeclareForBlock)
RewriteBlockLiteralFunctionDecl(CurFunctionDeclToDeclareForBlock);
int flag = 0;
int isa = 0;
SourceLocation DeclLoc = ND->getTypeSpecStartLoc();
if (DeclLoc.isInvalid())
// If type location is missing, it is because of missing type (a warning).
// Use variable's location which is good for this case.
DeclLoc = ND->getLocation();
const char *startBuf = SM->getCharacterData(DeclLoc);
SourceLocation X = ND->getLocEnd();
X = SM->getExpansionLoc(X);
const char *endBuf = SM->getCharacterData(X);
std::string Name(ND->getNameAsString());
std::string ByrefType;
RewriteByRefString(ByrefType, Name, ND, true);
ByrefType += " {\n";
ByrefType += " void *__isa;\n";
RewriteByRefString(ByrefType, Name, ND);
ByrefType += " *__forwarding;\n";
ByrefType += " int __flags;\n";
ByrefType += " int __size;\n";
// Add void *__Block_byref_id_object_copy;
// void *__Block_byref_id_object_dispose; if needed.
QualType Ty = ND->getType();
bool HasCopyAndDispose = Context->BlockRequiresCopying(Ty, ND);
if (HasCopyAndDispose) {
ByrefType += " void (*__Block_byref_id_object_copy)(void*, void*);\n";
ByrefType += " void (*__Block_byref_id_object_dispose)(void*);\n";
}
QualType T = Ty;
(void)convertBlockPointerToFunctionPointer(T);
T.getAsStringInternal(Name, Context->getPrintingPolicy());
ByrefType += " " + Name + ";\n";
ByrefType += "};\n";
// Insert this type in global scope. It is needed by helper function.
SourceLocation FunLocStart;
if (CurFunctionDef)
FunLocStart = CurFunctionDef->getTypeSpecStartLoc();
else {
assert(CurMethodDef && "RewriteByRefVar - CurMethodDef is null");
FunLocStart = CurMethodDef->getLocStart();
}
InsertText(FunLocStart, ByrefType);
if (Ty.isObjCGCWeak()) {
flag |= BLOCK_FIELD_IS_WEAK;
isa = 1;
}
if (HasCopyAndDispose) {
flag = BLOCK_BYREF_CALLER;
QualType Ty = ND->getType();
// FIXME. Handle __weak variable (BLOCK_FIELD_IS_WEAK) as well.
if (Ty->isBlockPointerType())
flag |= BLOCK_FIELD_IS_BLOCK;
else
flag |= BLOCK_FIELD_IS_OBJECT;
std::string HF = SynthesizeByrefCopyDestroyHelper(ND, flag);
if (!HF.empty())
InsertText(FunLocStart, HF);
}
// struct __Block_byref_ND ND =
// {0, &ND, some_flag, __size=sizeof(struct __Block_byref_ND),
// initializer-if-any};
bool hasInit = (ND->getInit() != nullptr);
unsigned flags = 0;
if (HasCopyAndDispose)
flags |= BLOCK_HAS_COPY_DISPOSE;
Name = ND->getNameAsString();
ByrefType.clear();
RewriteByRefString(ByrefType, Name, ND);
std::string ForwardingCastType("(");
ForwardingCastType += ByrefType + " *)";
if (!hasInit) {
ByrefType += " " + Name + " = {(void*)";
ByrefType += utostr(isa);
ByrefType += "," + ForwardingCastType + "&" + Name + ", ";
ByrefType += utostr(flags);
ByrefType += ", ";
ByrefType += "sizeof(";
RewriteByRefString(ByrefType, Name, ND);
ByrefType += ")";
if (HasCopyAndDispose) {
ByrefType += ", __Block_byref_id_object_copy_";
ByrefType += utostr(flag);
ByrefType += ", __Block_byref_id_object_dispose_";
ByrefType += utostr(flag);
}
ByrefType += "};\n";
unsigned nameSize = Name.size();
// for block or function pointer declaration. Name is aleady
// part of the declaration.
if (Ty->isBlockPointerType() || Ty->isFunctionPointerType())
nameSize = 1;
ReplaceText(DeclLoc, endBuf-startBuf+nameSize, ByrefType);
}
else {
SourceLocation startLoc;
Expr *E = ND->getInit();
if (const CStyleCastExpr *ECE = dyn_cast<CStyleCastExpr>(E))
startLoc = ECE->getLParenLoc();
else
startLoc = E->getLocStart();
startLoc = SM->getExpansionLoc(startLoc);
endBuf = SM->getCharacterData(startLoc);
ByrefType += " " + Name;
ByrefType += " = {(void*)";
ByrefType += utostr(isa);
ByrefType += "," + ForwardingCastType + "&" + Name + ", ";
ByrefType += utostr(flags);
ByrefType += ", ";
ByrefType += "sizeof(";
RewriteByRefString(ByrefType, Name, ND);
ByrefType += "), ";
if (HasCopyAndDispose) {
ByrefType += "__Block_byref_id_object_copy_";
ByrefType += utostr(flag);
ByrefType += ", __Block_byref_id_object_dispose_";
ByrefType += utostr(flag);
ByrefType += ", ";
}
ReplaceText(DeclLoc, endBuf-startBuf, ByrefType);
// Complete the newly synthesized compound expression by inserting a right
// curly brace before the end of the declaration.
// FIXME: This approach avoids rewriting the initializer expression. It
// also assumes there is only one declarator. For example, the following
// isn't currently supported by this routine (in general):
//
// double __block BYREFVAR = 1.34, BYREFVAR2 = 1.37;
//
const char *startInitializerBuf = SM->getCharacterData(startLoc);
const char *semiBuf = strchr(startInitializerBuf, ';');
assert((*semiBuf == ';') && "RewriteByRefVar: can't find ';'");
SourceLocation semiLoc =
startLoc.getLocWithOffset(semiBuf-startInitializerBuf);
InsertText(semiLoc, "}");
}
return;
}
void RewriteObjC::CollectBlockDeclRefInfo(BlockExpr *Exp) {
// Add initializers for any closure decl refs.
GetBlockDeclRefExprs(Exp->getBody());
if (BlockDeclRefs.size()) {
// Unique all "by copy" declarations.
for (unsigned i = 0; i < BlockDeclRefs.size(); i++)
if (!BlockDeclRefs[i]->getDecl()->hasAttr<BlocksAttr>()) {
if (!BlockByCopyDeclsPtrSet.count(BlockDeclRefs[i]->getDecl())) {
BlockByCopyDeclsPtrSet.insert(BlockDeclRefs[i]->getDecl());
BlockByCopyDecls.push_back(BlockDeclRefs[i]->getDecl());
}
}
// Unique all "by ref" declarations.
for (unsigned i = 0; i < BlockDeclRefs.size(); i++)
if (BlockDeclRefs[i]->getDecl()->hasAttr<BlocksAttr>()) {
if (!BlockByRefDeclsPtrSet.count(BlockDeclRefs[i]->getDecl())) {
BlockByRefDeclsPtrSet.insert(BlockDeclRefs[i]->getDecl());
BlockByRefDecls.push_back(BlockDeclRefs[i]->getDecl());
}
}
// Find any imported blocks...they will need special attention.
for (unsigned i = 0; i < BlockDeclRefs.size(); i++)
if (BlockDeclRefs[i]->getDecl()->hasAttr<BlocksAttr>() ||
BlockDeclRefs[i]->getType()->isObjCObjectPointerType() ||
BlockDeclRefs[i]->getType()->isBlockPointerType())
ImportedBlockDecls.insert(BlockDeclRefs[i]->getDecl());
}
}
FunctionDecl *RewriteObjC::SynthBlockInitFunctionDecl(StringRef name) {
IdentifierInfo *ID = &Context->Idents.get(name);
QualType FType = Context->getFunctionNoProtoType(Context->VoidPtrTy);
return FunctionDecl::Create(*Context, TUDecl, SourceLocation(),
SourceLocation(), ID, FType, nullptr, SC_Extern,
false, false);
}
Stmt *RewriteObjC::SynthBlockInitExpr(BlockExpr *Exp,
const SmallVectorImpl<DeclRefExpr *> &InnerBlockDeclRefs) {
const BlockDecl *block = Exp->getBlockDecl();
Blocks.push_back(Exp);
CollectBlockDeclRefInfo(Exp);
// Add inner imported variables now used in current block.
int countOfInnerDecls = 0;
if (!InnerBlockDeclRefs.empty()) {
for (unsigned i = 0; i < InnerBlockDeclRefs.size(); i++) {
DeclRefExpr *Exp = InnerBlockDeclRefs[i];
ValueDecl *VD = Exp->getDecl();
if (!VD->hasAttr<BlocksAttr>() && !BlockByCopyDeclsPtrSet.count(VD)) {
// We need to save the copied-in variables in nested
// blocks because it is needed at the end for some of the API generations.
// See SynthesizeBlockLiterals routine.
InnerDeclRefs.push_back(Exp); countOfInnerDecls++;
BlockDeclRefs.push_back(Exp);
BlockByCopyDeclsPtrSet.insert(VD);
BlockByCopyDecls.push_back(VD);
}
if (VD->hasAttr<BlocksAttr>() && !BlockByRefDeclsPtrSet.count(VD)) {
InnerDeclRefs.push_back(Exp); countOfInnerDecls++;
BlockDeclRefs.push_back(Exp);
BlockByRefDeclsPtrSet.insert(VD);
BlockByRefDecls.push_back(VD);
}
}
// Find any imported blocks...they will need special attention.
for (unsigned i = 0; i < InnerBlockDeclRefs.size(); i++)
if (InnerBlockDeclRefs[i]->getDecl()->hasAttr<BlocksAttr>() ||
InnerBlockDeclRefs[i]->getType()->isObjCObjectPointerType() ||
InnerBlockDeclRefs[i]->getType()->isBlockPointerType())
ImportedBlockDecls.insert(InnerBlockDeclRefs[i]->getDecl());
}
InnerDeclRefsCount.push_back(countOfInnerDecls);
std::string FuncName;
if (CurFunctionDef)
FuncName = CurFunctionDef->getNameAsString();
else if (CurMethodDef)
BuildUniqueMethodName(FuncName, CurMethodDef);
else if (GlobalVarDecl)
FuncName = std::string(GlobalVarDecl->getNameAsString());
std::string BlockNumber = utostr(Blocks.size()-1);
std::string Tag = "__" + FuncName + "_block_impl_" + BlockNumber;
std::string Func = "__" + FuncName + "_block_func_" + BlockNumber;
// Get a pointer to the function type so we can cast appropriately.
QualType BFT = convertFunctionTypeOfBlocks(Exp->getFunctionType());
QualType FType = Context->getPointerType(BFT);
FunctionDecl *FD;
Expr *NewRep;
// Simulate a constructor call...
FD = SynthBlockInitFunctionDecl(Tag);
DeclRefExpr *DRE = new (Context) DeclRefExpr(FD, false, FType, VK_RValue,
SourceLocation());
SmallVector<Expr*, 4> InitExprs;
// Initialize the block function.
FD = SynthBlockInitFunctionDecl(Func);
DeclRefExpr *Arg = new (Context) DeclRefExpr(FD, false, FD->getType(),
VK_LValue, SourceLocation());
CastExpr *castExpr = NoTypeInfoCStyleCastExpr(Context, Context->VoidPtrTy,
CK_BitCast, Arg);
InitExprs.push_back(castExpr);
// Initialize the block descriptor.
std::string DescData = "__" + FuncName + "_block_desc_" + BlockNumber + "_DATA";
VarDecl *NewVD = VarDecl::Create(*Context, TUDecl,
SourceLocation(), SourceLocation(),
&Context->Idents.get(DescData.c_str()),
Context->VoidPtrTy, nullptr,
SC_Static);
UnaryOperator *DescRefExpr =
new (Context) UnaryOperator(new (Context) DeclRefExpr(NewVD, false,
Context->VoidPtrTy,
VK_LValue,
SourceLocation()),
UO_AddrOf,
Context->getPointerType(Context->VoidPtrTy),
VK_RValue, OK_Ordinary,
SourceLocation());
InitExprs.push_back(DescRefExpr);
// Add initializers for any closure decl refs.
if (BlockDeclRefs.size()) {
Expr *Exp;
// Output all "by copy" declarations.
for (SmallVectorImpl<ValueDecl *>::iterator I = BlockByCopyDecls.begin(),
E = BlockByCopyDecls.end(); I != E; ++I) {
if (isObjCType((*I)->getType())) {
// FIXME: Conform to ABI ([[obj retain] autorelease]).
FD = SynthBlockInitFunctionDecl((*I)->getName());
Exp = new (Context) DeclRefExpr(FD, false, FD->getType(), VK_LValue,
SourceLocation());
if (HasLocalVariableExternalStorage(*I)) {
QualType QT = (*I)->getType();
QT = Context->getPointerType(QT);
Exp = new (Context) UnaryOperator(Exp, UO_AddrOf, QT, VK_RValue,
OK_Ordinary, SourceLocation());
}
} else if (isTopLevelBlockPointerType((*I)->getType())) {
FD = SynthBlockInitFunctionDecl((*I)->getName());
Arg = new (Context) DeclRefExpr(FD, false, FD->getType(), VK_LValue,
SourceLocation());
Exp = NoTypeInfoCStyleCastExpr(Context, Context->VoidPtrTy,
CK_BitCast, Arg);
} else {
FD = SynthBlockInitFunctionDecl((*I)->getName());
Exp = new (Context) DeclRefExpr(FD, false, FD->getType(), VK_LValue,
SourceLocation());
if (HasLocalVariableExternalStorage(*I)) {
QualType QT = (*I)->getType();
QT = Context->getPointerType(QT);
Exp = new (Context) UnaryOperator(Exp, UO_AddrOf, QT, VK_RValue,
OK_Ordinary, SourceLocation());
}
}
InitExprs.push_back(Exp);
}
// Output all "by ref" declarations.
for (SmallVectorImpl<ValueDecl *>::iterator I = BlockByRefDecls.begin(),
E = BlockByRefDecls.end(); I != E; ++I) {
ValueDecl *ND = (*I);
std::string Name(ND->getNameAsString());
std::string RecName;
RewriteByRefString(RecName, Name, ND, true);
IdentifierInfo *II = &Context->Idents.get(RecName.c_str()
+ sizeof("struct"));
RecordDecl *RD = RecordDecl::Create(*Context, TTK_Struct, TUDecl,
SourceLocation(), SourceLocation(),
II);
assert(RD && "SynthBlockInitExpr(): Can't find RecordDecl");
QualType castT = Context->getPointerType(Context->getTagDeclType(RD));
FD = SynthBlockInitFunctionDecl((*I)->getName());
Exp = new (Context) DeclRefExpr(FD, false, FD->getType(), VK_LValue,
SourceLocation());
bool isNestedCapturedVar = false;
if (block)
for (const auto &CI : block->captures()) {
const VarDecl *variable = CI.getVariable();
if (variable == ND && CI.isNested()) {
assert (CI.isByRef() &&
"SynthBlockInitExpr - captured block variable is not byref");
isNestedCapturedVar = true;
break;
}
}
// captured nested byref variable has its address passed. Do not take
// its address again.
if (!isNestedCapturedVar)
Exp = new (Context) UnaryOperator(Exp, UO_AddrOf,
Context->getPointerType(Exp->getType()),
VK_RValue, OK_Ordinary, SourceLocation());
Exp = NoTypeInfoCStyleCastExpr(Context, castT, CK_BitCast, Exp);
InitExprs.push_back(Exp);
}
}
if (ImportedBlockDecls.size()) {
// generate BLOCK_HAS_COPY_DISPOSE(have helper funcs) | BLOCK_HAS_DESCRIPTOR
int flag = (BLOCK_HAS_COPY_DISPOSE | BLOCK_HAS_DESCRIPTOR);
unsigned IntSize =
static_cast<unsigned>(Context->getTypeSize(Context->IntTy));
Expr *FlagExp = IntegerLiteral::Create(*Context, llvm::APInt(IntSize, flag),
Context->IntTy, SourceLocation());
InitExprs.push_back(FlagExp);
}
NewRep = new (Context) CallExpr(*Context, DRE, InitExprs,
FType, VK_LValue, SourceLocation());
NewRep = new (Context) UnaryOperator(NewRep, UO_AddrOf,
Context->getPointerType(NewRep->getType()),
VK_RValue, OK_Ordinary, SourceLocation());
NewRep = NoTypeInfoCStyleCastExpr(Context, FType, CK_BitCast,
NewRep);
BlockDeclRefs.clear();
BlockByRefDecls.clear();
BlockByRefDeclsPtrSet.clear();
BlockByCopyDecls.clear();
BlockByCopyDeclsPtrSet.clear();
ImportedBlockDecls.clear();
return NewRep;
}
bool RewriteObjC::IsDeclStmtInForeachHeader(DeclStmt *DS) {
if (const ObjCForCollectionStmt * CS =
dyn_cast<ObjCForCollectionStmt>(Stmts.back()))
return CS->getElement() == DS;
return false;
}
//===----------------------------------------------------------------------===//
// Function Body / Expression rewriting
//===----------------------------------------------------------------------===//
Stmt *RewriteObjC::RewriteFunctionBodyOrGlobalInitializer(Stmt *S) {
if (isa<SwitchStmt>(S) || isa<WhileStmt>(S) ||
isa<DoStmt>(S) || isa<ForStmt>(S))
Stmts.push_back(S);
else if (isa<ObjCForCollectionStmt>(S)) {
Stmts.push_back(S);
ObjCBcLabelNo.push_back(++BcLabelCount);
}
// Pseudo-object operations and ivar references need special
// treatment because we're going to recursively rewrite them.
if (PseudoObjectExpr *PseudoOp = dyn_cast<PseudoObjectExpr>(S)) {
if (isa<BinaryOperator>(PseudoOp->getSyntacticForm())) {
return RewritePropertyOrImplicitSetter(PseudoOp);
} else {
return RewritePropertyOrImplicitGetter(PseudoOp);
}
} else if (ObjCIvarRefExpr *IvarRefExpr = dyn_cast<ObjCIvarRefExpr>(S)) {
return RewriteObjCIvarRefExpr(IvarRefExpr);
}
SourceRange OrigStmtRange = S->getSourceRange();
// Perform a bottom up rewrite of all children.
for (Stmt::child_range CI = S->children(); CI; ++CI)
if (*CI) {
Stmt *childStmt = (*CI);
Stmt *newStmt = RewriteFunctionBodyOrGlobalInitializer(childStmt);
if (newStmt) {
*CI = newStmt;
}
}
if (BlockExpr *BE = dyn_cast<BlockExpr>(S)) {
SmallVector<DeclRefExpr *, 8> InnerBlockDeclRefs;
llvm::SmallPtrSet<const DeclContext *, 8> InnerContexts;
InnerContexts.insert(BE->getBlockDecl());
ImportedLocalExternalDecls.clear();
GetInnerBlockDeclRefExprs(BE->getBody(),
InnerBlockDeclRefs, InnerContexts);
// Rewrite the block body in place.
Stmt *SaveCurrentBody = CurrentBody;
CurrentBody = BE->getBody();
PropParentMap = nullptr;
// block literal on rhs of a property-dot-sytax assignment
// must be replaced by its synthesize ast so getRewrittenText
// works as expected. In this case, what actually ends up on RHS
// is the blockTranscribed which is the helper function for the
// block literal; as in: self.c = ^() {[ace ARR];};
bool saveDisableReplaceStmt = DisableReplaceStmt;
DisableReplaceStmt = false;
RewriteFunctionBodyOrGlobalInitializer(BE->getBody());
DisableReplaceStmt = saveDisableReplaceStmt;
CurrentBody = SaveCurrentBody;
PropParentMap = nullptr;
ImportedLocalExternalDecls.clear();
// Now we snarf the rewritten text and stash it away for later use.
std::string Str = Rewrite.getRewrittenText(BE->getSourceRange());
RewrittenBlockExprs[BE] = Str;
Stmt *blockTranscribed = SynthBlockInitExpr(BE, InnerBlockDeclRefs);
//blockTranscribed->dump();
ReplaceStmt(S, blockTranscribed);
return blockTranscribed;
}
// Handle specific things.
if (ObjCEncodeExpr *AtEncode = dyn_cast<ObjCEncodeExpr>(S))
return RewriteAtEncode(AtEncode);
if (ObjCSelectorExpr *AtSelector = dyn_cast<ObjCSelectorExpr>(S))
return RewriteAtSelector(AtSelector);
if (ObjCStringLiteral *AtString = dyn_cast<ObjCStringLiteral>(S))
return RewriteObjCStringLiteral(AtString);
if (ObjCMessageExpr *MessExpr = dyn_cast<ObjCMessageExpr>(S)) {
#if 0
// Before we rewrite it, put the original message expression in a comment.
SourceLocation startLoc = MessExpr->getLocStart();
SourceLocation endLoc = MessExpr->getLocEnd();
const char *startBuf = SM->getCharacterData(startLoc);
const char *endBuf = SM->getCharacterData(endLoc);
std::string messString;
messString += "// ";
messString.append(startBuf, endBuf-startBuf+1);
messString += "\n";
// FIXME: Missing definition of
// InsertText(clang::SourceLocation, char const*, unsigned int).
// InsertText(startLoc, messString.c_str(), messString.size());
// Tried this, but it didn't work either...
// ReplaceText(startLoc, 0, messString.c_str(), messString.size());
#endif
return RewriteMessageExpr(MessExpr);
}
if (ObjCAtTryStmt *StmtTry = dyn_cast<ObjCAtTryStmt>(S))
return RewriteObjCTryStmt(StmtTry);
if (ObjCAtSynchronizedStmt *StmtTry = dyn_cast<ObjCAtSynchronizedStmt>(S))
return RewriteObjCSynchronizedStmt(StmtTry);
if (ObjCAtThrowStmt *StmtThrow = dyn_cast<ObjCAtThrowStmt>(S))
return RewriteObjCThrowStmt(StmtThrow);
if (ObjCProtocolExpr *ProtocolExp = dyn_cast<ObjCProtocolExpr>(S))
return RewriteObjCProtocolExpr(ProtocolExp);
if (ObjCForCollectionStmt *StmtForCollection =
dyn_cast<ObjCForCollectionStmt>(S))
return RewriteObjCForCollectionStmt(StmtForCollection,
OrigStmtRange.getEnd());
if (BreakStmt *StmtBreakStmt =
dyn_cast<BreakStmt>(S))
return RewriteBreakStmt(StmtBreakStmt);
if (ContinueStmt *StmtContinueStmt =
dyn_cast<ContinueStmt>(S))
return RewriteContinueStmt(StmtContinueStmt);
// Need to check for protocol refs (id <P>, Foo <P> *) in variable decls
// and cast exprs.
if (DeclStmt *DS = dyn_cast<DeclStmt>(S)) {
// FIXME: What we're doing here is modifying the type-specifier that
// precedes the first Decl. In the future the DeclGroup should have
// a separate type-specifier that we can rewrite.
// NOTE: We need to avoid rewriting the DeclStmt if it is within
// the context of an ObjCForCollectionStmt. For example:
// NSArray *someArray;
// for (id <FooProtocol> index in someArray) ;
// This is because RewriteObjCForCollectionStmt() does textual rewriting
// and it depends on the original text locations/positions.
if (Stmts.empty() || !IsDeclStmtInForeachHeader(DS))
RewriteObjCQualifiedInterfaceTypes(*DS->decl_begin());
// Blocks rewrite rules.
for (auto *SD : DS->decls()) {
if (ValueDecl *ND = dyn_cast<ValueDecl>(SD)) {
if (isTopLevelBlockPointerType(ND->getType()))
RewriteBlockPointerDecl(ND);
else if (ND->getType()->isFunctionPointerType())
CheckFunctionPointerDecl(ND->getType(), ND);
if (VarDecl *VD = dyn_cast<VarDecl>(SD)) {
if (VD->hasAttr<BlocksAttr>()) {
static unsigned uniqueByrefDeclCount = 0;
assert(!BlockByRefDeclNo.count(ND) &&
"RewriteFunctionBodyOrGlobalInitializer: Duplicate byref decl");
BlockByRefDeclNo[ND] = uniqueByrefDeclCount++;
RewriteByRefVar(VD);
}
else
RewriteTypeOfDecl(VD);
}
}
if (TypedefNameDecl *TD = dyn_cast<TypedefNameDecl>(SD)) {
if (isTopLevelBlockPointerType(TD->getUnderlyingType()))
RewriteBlockPointerDecl(TD);
else if (TD->getUnderlyingType()->isFunctionPointerType())
CheckFunctionPointerDecl(TD->getUnderlyingType(), TD);
}
}
}
if (CStyleCastExpr *CE = dyn_cast<CStyleCastExpr>(S))
RewriteObjCQualifiedInterfaceTypes(CE);
if (isa<SwitchStmt>(S) || isa<WhileStmt>(S) ||
isa<DoStmt>(S) || isa<ForStmt>(S)) {
assert(!Stmts.empty() && "Statement stack is empty");
assert ((isa<SwitchStmt>(Stmts.back()) || isa<WhileStmt>(Stmts.back()) ||
isa<DoStmt>(Stmts.back()) || isa<ForStmt>(Stmts.back()))
&& "Statement stack mismatch");
Stmts.pop_back();
}
// Handle blocks rewriting.
if (DeclRefExpr *DRE = dyn_cast<DeclRefExpr>(S)) {
ValueDecl *VD = DRE->getDecl();
if (VD->hasAttr<BlocksAttr>())
return RewriteBlockDeclRefExpr(DRE);
if (HasLocalVariableExternalStorage(VD))
return RewriteLocalVariableExternalStorage(DRE);
}
if (CallExpr *CE = dyn_cast<CallExpr>(S)) {
if (CE->getCallee()->getType()->isBlockPointerType()) {
Stmt *BlockCall = SynthesizeBlockCall(CE, CE->getCallee());
ReplaceStmt(S, BlockCall);
return BlockCall;
}
}
if (CStyleCastExpr *CE = dyn_cast<CStyleCastExpr>(S)) {
RewriteCastExpr(CE);
}
#if 0
if (ImplicitCastExpr *ICE = dyn_cast<ImplicitCastExpr>(S)) {
CastExpr *Replacement = new (Context) CastExpr(ICE->getType(),
ICE->getSubExpr(),
SourceLocation());
// Get the new text.
std::string SStr;
llvm::raw_string_ostream Buf(SStr);
Replacement->printPretty(Buf);
const std::string &Str = Buf.str();
printf("CAST = %s\n", &Str[0]);
InsertText(ICE->getSubExpr()->getLocStart(), &Str[0], Str.size());
delete S;
return Replacement;
}
#endif
// Return this stmt unmodified.
return S;
}
void RewriteObjC::RewriteRecordBody(RecordDecl *RD) {
for (auto *FD : RD->fields()) {
if (isTopLevelBlockPointerType(FD->getType()))
RewriteBlockPointerDecl(FD);
if (FD->getType()->isObjCQualifiedIdType() ||
FD->getType()->isObjCQualifiedInterfaceType())
RewriteObjCQualifiedInterfaceTypes(FD);
}
}
/// HandleDeclInMainFile - This is called for each top-level decl defined in the
/// main file of the input.
void RewriteObjC::HandleDeclInMainFile(Decl *D) {
switch (D->getKind()) {
case Decl::Function: {
FunctionDecl *FD = cast<FunctionDecl>(D);
if (FD->isOverloadedOperator())
return;
// Since function prototypes don't have ParmDecl's, we check the function
// prototype. This enables us to rewrite function declarations and
// definitions using the same code.
RewriteBlocksInFunctionProtoType(FD->getType(), FD);
if (!FD->isThisDeclarationADefinition())
break;
// FIXME: If this should support Obj-C++, support CXXTryStmt
if (CompoundStmt *Body = dyn_cast_or_null<CompoundStmt>(FD->getBody())) {
CurFunctionDef = FD;
CurFunctionDeclToDeclareForBlock = FD;
CurrentBody = Body;
Body =
cast_or_null<CompoundStmt>(RewriteFunctionBodyOrGlobalInitializer(Body));
FD->setBody(Body);
CurrentBody = nullptr;
if (PropParentMap) {
delete PropParentMap;
PropParentMap = nullptr;
}
// This synthesizes and inserts the block "impl" struct, invoke function,
// and any copy/dispose helper functions.
InsertBlockLiteralsWithinFunction(FD);
CurFunctionDef = nullptr;
CurFunctionDeclToDeclareForBlock = nullptr;
}
break;
}
case Decl::ObjCMethod: {
ObjCMethodDecl *MD = cast<ObjCMethodDecl>(D);
if (CompoundStmt *Body = MD->getCompoundBody()) {
CurMethodDef = MD;
CurrentBody = Body;
Body =
cast_or_null<CompoundStmt>(RewriteFunctionBodyOrGlobalInitializer(Body));
MD->setBody(Body);
CurrentBody = nullptr;
if (PropParentMap) {
delete PropParentMap;
PropParentMap = nullptr;
}
InsertBlockLiteralsWithinMethod(MD);
CurMethodDef = nullptr;
}
break;
}
case Decl::ObjCImplementation: {
ObjCImplementationDecl *CI = cast<ObjCImplementationDecl>(D);
ClassImplementation.push_back(CI);
break;
}
case Decl::ObjCCategoryImpl: {
ObjCCategoryImplDecl *CI = cast<ObjCCategoryImplDecl>(D);
CategoryImplementation.push_back(CI);
break;
}
case Decl::Var: {
VarDecl *VD = cast<VarDecl>(D);
RewriteObjCQualifiedInterfaceTypes(VD);
if (isTopLevelBlockPointerType(VD->getType()))
RewriteBlockPointerDecl(VD);
else if (VD->getType()->isFunctionPointerType()) {
CheckFunctionPointerDecl(VD->getType(), VD);
if (VD->getInit()) {
if (CStyleCastExpr *CE = dyn_cast<CStyleCastExpr>(VD->getInit())) {
RewriteCastExpr(CE);
}
}
} else if (VD->getType()->isRecordType()) {
RecordDecl *RD = VD->getType()->getAs<RecordType>()->getDecl();
if (RD->isCompleteDefinition())
RewriteRecordBody(RD);
}
if (VD->getInit()) {
GlobalVarDecl = VD;
CurrentBody = VD->getInit();
RewriteFunctionBodyOrGlobalInitializer(VD->getInit());
CurrentBody = nullptr;
if (PropParentMap) {
delete PropParentMap;
PropParentMap = nullptr;
}
SynthesizeBlockLiterals(VD->getTypeSpecStartLoc(), VD->getName());
GlobalVarDecl = nullptr;
// This is needed for blocks.
if (CStyleCastExpr *CE = dyn_cast<CStyleCastExpr>(VD->getInit())) {
RewriteCastExpr(CE);
}
}
break;
}
case Decl::TypeAlias:
case Decl::Typedef: {
if (TypedefNameDecl *TD = dyn_cast<TypedefNameDecl>(D)) {
if (isTopLevelBlockPointerType(TD->getUnderlyingType()))
RewriteBlockPointerDecl(TD);
else if (TD->getUnderlyingType()->isFunctionPointerType())
CheckFunctionPointerDecl(TD->getUnderlyingType(), TD);
}
break;
}
case Decl::CXXRecord:
case Decl::Record: {
RecordDecl *RD = cast<RecordDecl>(D);
if (RD->isCompleteDefinition())
RewriteRecordBody(RD);
break;
}
default:
break;
}
// Nothing yet.
}
void RewriteObjC::HandleTranslationUnit(ASTContext &C) {
if (Diags.hasErrorOccurred())
return;
RewriteInclude();
// Here's a great place to add any extra declarations that may be needed.
// Write out meta data for each @protocol(<expr>).
for (ObjCProtocolDecl *ProtDecl : ProtocolExprDecls)
RewriteObjCProtocolMetaData(ProtDecl, "", "", Preamble);
InsertText(SM->getLocForStartOfFile(MainFileID), Preamble, false);
if (ClassImplementation.size() || CategoryImplementation.size())
RewriteImplementations();
// Get the buffer corresponding to MainFileID. If we haven't changed it, then
// we are done.
if (const RewriteBuffer *RewriteBuf =
Rewrite.getRewriteBufferFor(MainFileID)) {
//printf("Changed:\n");
*OutFile << std::string(RewriteBuf->begin(), RewriteBuf->end());
} else {
llvm::errs() << "No changes\n";
}
if (ClassImplementation.size() || CategoryImplementation.size() ||
ProtocolExprDecls.size()) {
// Rewrite Objective-c meta data*
std::string ResultStr;
RewriteMetaDataIntoBuffer(ResultStr);
// Emit metadata.
*OutFile << ResultStr;
}
OutFile->flush();
}
void RewriteObjCFragileABI::Initialize(ASTContext &context) {
InitializeCommon(context);
// declaring objc_selector outside the parameter list removes a silly
// scope related warning...
if (IsHeader)
Preamble = "#pragma once\n";
Preamble += "struct objc_selector; struct objc_class;\n";
Preamble += "struct __rw_objc_super { struct objc_object *object; ";
Preamble += "struct objc_object *superClass; ";
if (LangOpts.MicrosoftExt) {
// Add a constructor for creating temporary objects.
Preamble += "__rw_objc_super(struct objc_object *o, struct objc_object *s) "
": ";
Preamble += "object(o), superClass(s) {} ";
}
Preamble += "};\n";
Preamble += "#ifndef _REWRITER_typedef_Protocol\n";
Preamble += "typedef struct objc_object Protocol;\n";
Preamble += "#define _REWRITER_typedef_Protocol\n";
Preamble += "#endif\n";
if (LangOpts.MicrosoftExt) {
Preamble += "#define __OBJC_RW_DLLIMPORT extern \"C\" __declspec(dllimport)\n";
Preamble += "#define __OBJC_RW_STATICIMPORT extern \"C\"\n";
} else
Preamble += "#define __OBJC_RW_DLLIMPORT extern\n";
Preamble += "__OBJC_RW_DLLIMPORT struct objc_object *objc_msgSend";
Preamble += "(struct objc_object *, struct objc_selector *, ...);\n";
Preamble += "__OBJC_RW_DLLIMPORT struct objc_object *objc_msgSendSuper";
Preamble += "(struct objc_super *, struct objc_selector *, ...);\n";
Preamble += "__OBJC_RW_DLLIMPORT struct objc_object* objc_msgSend_stret";
Preamble += "(struct objc_object *, struct objc_selector *, ...);\n";
Preamble += "__OBJC_RW_DLLIMPORT struct objc_object* objc_msgSendSuper_stret";
Preamble += "(struct objc_super *, struct objc_selector *, ...);\n";
Preamble += "__OBJC_RW_DLLIMPORT double objc_msgSend_fpret";
Preamble += "(struct objc_object *, struct objc_selector *, ...);\n";
Preamble += "__OBJC_RW_DLLIMPORT struct objc_object *objc_getClass";
Preamble += "(const char *);\n";
Preamble += "__OBJC_RW_DLLIMPORT struct objc_class *class_getSuperclass";
Preamble += "(struct objc_class *);\n";
Preamble += "__OBJC_RW_DLLIMPORT struct objc_object *objc_getMetaClass";
Preamble += "(const char *);\n";
Preamble += "__OBJC_RW_DLLIMPORT void objc_exception_throw(struct objc_object *);\n";
Preamble += "__OBJC_RW_DLLIMPORT void objc_exception_try_enter(void *);\n";
Preamble += "__OBJC_RW_DLLIMPORT void objc_exception_try_exit(void *);\n";
Preamble += "__OBJC_RW_DLLIMPORT struct objc_object *objc_exception_extract(void *);\n";
Preamble += "__OBJC_RW_DLLIMPORT int objc_exception_match";
Preamble += "(struct objc_class *, struct objc_object *);\n";
// @synchronized hooks.
Preamble += "__OBJC_RW_DLLIMPORT int objc_sync_enter(struct objc_object *);\n";
Preamble += "__OBJC_RW_DLLIMPORT int objc_sync_exit(struct objc_object *);\n";
Preamble += "__OBJC_RW_DLLIMPORT Protocol *objc_getProtocol(const char *);\n";
Preamble += "#ifndef __FASTENUMERATIONSTATE\n";
Preamble += "struct __objcFastEnumerationState {\n\t";
Preamble += "unsigned long state;\n\t";
Preamble += "void **itemsPtr;\n\t";
Preamble += "unsigned long *mutationsPtr;\n\t";
Preamble += "unsigned long extra[5];\n};\n";
Preamble += "__OBJC_RW_DLLIMPORT void objc_enumerationMutation(struct objc_object *);\n";
Preamble += "#define __FASTENUMERATIONSTATE\n";
Preamble += "#endif\n";
Preamble += "#ifndef __NSCONSTANTSTRINGIMPL\n";
Preamble += "struct __NSConstantStringImpl {\n";
Preamble += " int *isa;\n";
Preamble += " int flags;\n";
Preamble += " char *str;\n";
Preamble += " long length;\n";
Preamble += "};\n";
Preamble += "#ifdef CF_EXPORT_CONSTANT_STRING\n";
Preamble += "extern \"C\" __declspec(dllexport) int __CFConstantStringClassReference[];\n";
Preamble += "#else\n";
Preamble += "__OBJC_RW_DLLIMPORT int __CFConstantStringClassReference[];\n";
Preamble += "#endif\n";
Preamble += "#define __NSCONSTANTSTRINGIMPL\n";
Preamble += "#endif\n";
// Blocks preamble.
Preamble += "#ifndef BLOCK_IMPL\n";
Preamble += "#define BLOCK_IMPL\n";
Preamble += "struct __block_impl {\n";
Preamble += " void *isa;\n";
Preamble += " int Flags;\n";
Preamble += " int Reserved;\n";
Preamble += " void *FuncPtr;\n";
Preamble += "};\n";
Preamble += "// Runtime copy/destroy helper functions (from Block_private.h)\n";
Preamble += "#ifdef __OBJC_EXPORT_BLOCKS\n";
Preamble += "extern \"C\" __declspec(dllexport) "
"void _Block_object_assign(void *, const void *, const int);\n";
Preamble += "extern \"C\" __declspec(dllexport) void _Block_object_dispose(const void *, const int);\n";
Preamble += "extern \"C\" __declspec(dllexport) void *_NSConcreteGlobalBlock[32];\n";
Preamble += "extern \"C\" __declspec(dllexport) void *_NSConcreteStackBlock[32];\n";
Preamble += "#else\n";
Preamble += "__OBJC_RW_DLLIMPORT void _Block_object_assign(void *, const void *, const int);\n";
Preamble += "__OBJC_RW_DLLIMPORT void _Block_object_dispose(const void *, const int);\n";
Preamble += "__OBJC_RW_DLLIMPORT void *_NSConcreteGlobalBlock[32];\n";
Preamble += "__OBJC_RW_DLLIMPORT void *_NSConcreteStackBlock[32];\n";
Preamble += "#endif\n";
Preamble += "#endif\n";
if (LangOpts.MicrosoftExt) {
Preamble += "#undef __OBJC_RW_DLLIMPORT\n";
Preamble += "#undef __OBJC_RW_STATICIMPORT\n";
Preamble += "#ifndef KEEP_ATTRIBUTES\n"; // We use this for clang tests.
Preamble += "#define __attribute__(X)\n";
Preamble += "#endif\n";
Preamble += "#define __weak\n";
}
else {
Preamble += "#define __block\n";
Preamble += "#define __weak\n";
}
// NOTE! Windows uses LLP64 for 64bit mode. So, cast pointer to long long
// as this avoids warning in any 64bit/32bit compilation model.
Preamble += "\n#define __OFFSETOFIVAR__(TYPE, MEMBER) ((long long) &((TYPE *)0)->MEMBER)\n";
}
/// RewriteIvarOffsetComputation - This rutine synthesizes computation of
/// ivar offset.
void RewriteObjCFragileABI::RewriteIvarOffsetComputation(ObjCIvarDecl *ivar,
std::string &Result) {
if (ivar->isBitField()) {
// FIXME: The hack below doesn't work for bitfields. For now, we simply
// place all bitfields at offset 0.
Result += "0";
} else {
Result += "__OFFSETOFIVAR__(struct ";
Result += ivar->getContainingInterface()->getNameAsString();
if (LangOpts.MicrosoftExt)
Result += "_IMPL";
Result += ", ";
Result += ivar->getNameAsString();
Result += ")";
}
}
/// RewriteObjCProtocolMetaData - Rewrite protocols meta-data.
void RewriteObjCFragileABI::RewriteObjCProtocolMetaData(
ObjCProtocolDecl *PDecl, StringRef prefix,
StringRef ClassName, std::string &Result) {
static bool objc_protocol_methods = false;
// Output struct protocol_methods holder of method selector and type.
if (!objc_protocol_methods && PDecl->hasDefinition()) {
/* struct protocol_methods {
SEL _cmd;
char *method_types;
}
*/
Result += "\nstruct _protocol_methods {\n";
Result += "\tstruct objc_selector *_cmd;\n";
Result += "\tchar *method_types;\n";
Result += "};\n";
objc_protocol_methods = true;
}
// Do not synthesize the protocol more than once.
if (ObjCSynthesizedProtocols.count(PDecl->getCanonicalDecl()))
return;
if (ObjCProtocolDecl *Def = PDecl->getDefinition())
PDecl = Def;
if (PDecl->instmeth_begin() != PDecl->instmeth_end()) {
unsigned NumMethods = std::distance(PDecl->instmeth_begin(),
PDecl->instmeth_end());
/* struct _objc_protocol_method_list {
int protocol_method_count;
struct protocol_methods protocols[];
}
*/
Result += "\nstatic struct {\n";
Result += "\tint protocol_method_count;\n";
Result += "\tstruct _protocol_methods protocol_methods[";
Result += utostr(NumMethods);
Result += "];\n} _OBJC_PROTOCOL_INSTANCE_METHODS_";
Result += PDecl->getNameAsString();
Result += " __attribute__ ((used, section (\"__OBJC, __cat_inst_meth\")))= "
"{\n\t" + utostr(NumMethods) + "\n";
// Output instance methods declared in this protocol.
for (ObjCProtocolDecl::instmeth_iterator
I = PDecl->instmeth_begin(), E = PDecl->instmeth_end();
I != E; ++I) {
if (I == PDecl->instmeth_begin())
Result += "\t ,{{(struct objc_selector *)\"";
else
Result += "\t ,{(struct objc_selector *)\"";
Result += (*I)->getSelector().getAsString();
std::string MethodTypeString;
Context->getObjCEncodingForMethodDecl((*I), MethodTypeString);
Result += "\", \"";
Result += MethodTypeString;
Result += "\"}\n";
}
Result += "\t }\n};\n";
}
// Output class methods declared in this protocol.
unsigned NumMethods = std::distance(PDecl->classmeth_begin(),
PDecl->classmeth_end());
if (NumMethods > 0) {
/* struct _objc_protocol_method_list {
int protocol_method_count;
struct protocol_methods protocols[];
}
*/
Result += "\nstatic struct {\n";
Result += "\tint protocol_method_count;\n";
Result += "\tstruct _protocol_methods protocol_methods[";
Result += utostr(NumMethods);
Result += "];\n} _OBJC_PROTOCOL_CLASS_METHODS_";
Result += PDecl->getNameAsString();
Result += " __attribute__ ((used, section (\"__OBJC, __cat_cls_meth\")))= "
"{\n\t";
Result += utostr(NumMethods);
Result += "\n";
// Output instance methods declared in this protocol.
for (ObjCProtocolDecl::classmeth_iterator
I = PDecl->classmeth_begin(), E = PDecl->classmeth_end();
I != E; ++I) {
if (I == PDecl->classmeth_begin())
Result += "\t ,{{(struct objc_selector *)\"";
else
Result += "\t ,{(struct objc_selector *)\"";
Result += (*I)->getSelector().getAsString();
std::string MethodTypeString;
Context->getObjCEncodingForMethodDecl((*I), MethodTypeString);
Result += "\", \"";
Result += MethodTypeString;
Result += "\"}\n";
}
Result += "\t }\n};\n";
}
// Output:
/* struct _objc_protocol {
// Objective-C 1.0 extensions
struct _objc_protocol_extension *isa;
char *protocol_name;
struct _objc_protocol **protocol_list;
struct _objc_protocol_method_list *instance_methods;
struct _objc_protocol_method_list *class_methods;
};
*/
static bool objc_protocol = false;
if (!objc_protocol) {
Result += "\nstruct _objc_protocol {\n";
Result += "\tstruct _objc_protocol_extension *isa;\n";
Result += "\tchar *protocol_name;\n";
Result += "\tstruct _objc_protocol **protocol_list;\n";
Result += "\tstruct _objc_protocol_method_list *instance_methods;\n";
Result += "\tstruct _objc_protocol_method_list *class_methods;\n";
Result += "};\n";
objc_protocol = true;
}
Result += "\nstatic struct _objc_protocol _OBJC_PROTOCOL_";
Result += PDecl->getNameAsString();
Result += " __attribute__ ((used, section (\"__OBJC, __protocol\")))= "
"{\n\t0, \"";
Result += PDecl->getNameAsString();
Result += "\", 0, ";
if (PDecl->instmeth_begin() != PDecl->instmeth_end()) {
Result += "(struct _objc_protocol_method_list *)&_OBJC_PROTOCOL_INSTANCE_METHODS_";
Result += PDecl->getNameAsString();
Result += ", ";
}
else
Result += "0, ";
if (PDecl->classmeth_begin() != PDecl->classmeth_end()) {
Result += "(struct _objc_protocol_method_list *)&_OBJC_PROTOCOL_CLASS_METHODS_";
Result += PDecl->getNameAsString();
Result += "\n";
}
else
Result += "0\n";
Result += "};\n";
// Mark this protocol as having been generated.
if (!ObjCSynthesizedProtocols.insert(PDecl->getCanonicalDecl()).second)
llvm_unreachable("protocol already synthesized");
}
void RewriteObjCFragileABI::RewriteObjCProtocolListMetaData(
const ObjCList<ObjCProtocolDecl> &Protocols,
StringRef prefix, StringRef ClassName,
std::string &Result) {
if (Protocols.empty()) return;
for (unsigned i = 0; i != Protocols.size(); i++)
RewriteObjCProtocolMetaData(Protocols[i], prefix, ClassName, Result);
// Output the top lovel protocol meta-data for the class.
/* struct _objc_protocol_list {
struct _objc_protocol_list *next;
int protocol_count;
struct _objc_protocol *class_protocols[];
}
*/
Result += "\nstatic struct {\n";
Result += "\tstruct _objc_protocol_list *next;\n";
Result += "\tint protocol_count;\n";
Result += "\tstruct _objc_protocol *class_protocols[";
Result += utostr(Protocols.size());
Result += "];\n} _OBJC_";
Result += prefix;
Result += "_PROTOCOLS_";
Result += ClassName;
Result += " __attribute__ ((used, section (\"__OBJC, __cat_cls_meth\")))= "
"{\n\t0, ";
Result += utostr(Protocols.size());
Result += "\n";
Result += "\t,{&_OBJC_PROTOCOL_";
Result += Protocols[0]->getNameAsString();
Result += " \n";
for (unsigned i = 1; i != Protocols.size(); i++) {
Result += "\t ,&_OBJC_PROTOCOL_";
Result += Protocols[i]->getNameAsString();
Result += "\n";
}
Result += "\t }\n};\n";
}
void RewriteObjCFragileABI::RewriteObjCClassMetaData(ObjCImplementationDecl *IDecl,
std::string &Result) {
ObjCInterfaceDecl *CDecl = IDecl->getClassInterface();
// Explicitly declared @interface's are already synthesized.
if (CDecl->isImplicitInterfaceDecl()) {
// FIXME: Implementation of a class with no @interface (legacy) does not
// produce correct synthesis as yet.
RewriteObjCInternalStruct(CDecl, Result);
}
// Build _objc_ivar_list metadata for classes ivars if needed
unsigned NumIvars = !IDecl->ivar_empty()
? IDecl->ivar_size()
: (CDecl ? CDecl->ivar_size() : 0);
if (NumIvars > 0) {
static bool objc_ivar = false;
if (!objc_ivar) {
/* struct _objc_ivar {
char *ivar_name;
char *ivar_type;
int ivar_offset;
};
*/
Result += "\nstruct _objc_ivar {\n";
Result += "\tchar *ivar_name;\n";
Result += "\tchar *ivar_type;\n";
Result += "\tint ivar_offset;\n";
Result += "};\n";
objc_ivar = true;
}
/* struct {
int ivar_count;
struct _objc_ivar ivar_list[nIvars];
};
*/
Result += "\nstatic struct {\n";
Result += "\tint ivar_count;\n";
Result += "\tstruct _objc_ivar ivar_list[";
Result += utostr(NumIvars);
Result += "];\n} _OBJC_INSTANCE_VARIABLES_";
Result += IDecl->getNameAsString();
Result += " __attribute__ ((used, section (\"__OBJC, __instance_vars\")))= "
"{\n\t";
Result += utostr(NumIvars);
Result += "\n";
ObjCInterfaceDecl::ivar_iterator IVI, IVE;
SmallVector<ObjCIvarDecl *, 8> IVars;
if (!IDecl->ivar_empty()) {
for (auto *IV : IDecl->ivars())
IVars.push_back(IV);
IVI = IDecl->ivar_begin();
IVE = IDecl->ivar_end();
} else {
IVI = CDecl->ivar_begin();
IVE = CDecl->ivar_end();
}
Result += "\t,{{\"";
Result += IVI->getNameAsString();
Result += "\", \"";
std::string TmpString, StrEncoding;
Context->getObjCEncodingForType(IVI->getType(), TmpString, *IVI);
QuoteDoublequotes(TmpString, StrEncoding);
Result += StrEncoding;
Result += "\", ";
RewriteIvarOffsetComputation(*IVI, Result);
Result += "}\n";
for (++IVI; IVI != IVE; ++IVI) {
Result += "\t ,{\"";
Result += IVI->getNameAsString();
Result += "\", \"";
std::string TmpString, StrEncoding;
Context->getObjCEncodingForType(IVI->getType(), TmpString, *IVI);
QuoteDoublequotes(TmpString, StrEncoding);
Result += StrEncoding;
Result += "\", ";
RewriteIvarOffsetComputation(*IVI, Result);
Result += "}\n";
}
Result += "\t }\n};\n";
}
// Build _objc_method_list for class's instance methods if needed
SmallVector<ObjCMethodDecl *, 32> InstanceMethods(IDecl->instance_methods());
// If any of our property implementations have associated getters or
// setters, produce metadata for them as well.
for (const auto *Prop : IDecl->property_impls()) {
if (Prop->getPropertyImplementation() == ObjCPropertyImplDecl::Dynamic)
continue;
if (!Prop->getPropertyIvarDecl())
continue;
ObjCPropertyDecl *PD = Prop->getPropertyDecl();
if (!PD)
continue;
if (ObjCMethodDecl *Getter = PD->getGetterMethodDecl())
if (!Getter->isDefined())
InstanceMethods.push_back(Getter);
if (PD->isReadOnly())
continue;
if (ObjCMethodDecl *Setter = PD->getSetterMethodDecl())
if (!Setter->isDefined())
InstanceMethods.push_back(Setter);
}
RewriteObjCMethodsMetaData(InstanceMethods.begin(), InstanceMethods.end(),
true, "", IDecl->getName(), Result);
// Build _objc_method_list for class's class methods if needed
RewriteObjCMethodsMetaData(IDecl->classmeth_begin(), IDecl->classmeth_end(),
false, "", IDecl->getName(), Result);
// Protocols referenced in class declaration?
RewriteObjCProtocolListMetaData(CDecl->getReferencedProtocols(),
"CLASS", CDecl->getName(), Result);
// Declaration of class/meta-class metadata
/* struct _objc_class {
struct _objc_class *isa; // or const char *root_class_name when metadata
const char *super_class_name;
char *name;
long version;
long info;
long instance_size;
struct _objc_ivar_list *ivars;
struct _objc_method_list *methods;
struct objc_cache *cache;
struct objc_protocol_list *protocols;
const char *ivar_layout;
struct _objc_class_ext *ext;
};
*/
static bool objc_class = false;
if (!objc_class) {
Result += "\nstruct _objc_class {\n";
Result += "\tstruct _objc_class *isa;\n";
Result += "\tconst char *super_class_name;\n";
Result += "\tchar *name;\n";
Result += "\tlong version;\n";
Result += "\tlong info;\n";
Result += "\tlong instance_size;\n";
Result += "\tstruct _objc_ivar_list *ivars;\n";
Result += "\tstruct _objc_method_list *methods;\n";
Result += "\tstruct objc_cache *cache;\n";
Result += "\tstruct _objc_protocol_list *protocols;\n";
Result += "\tconst char *ivar_layout;\n";
Result += "\tstruct _objc_class_ext *ext;\n";
Result += "};\n";
objc_class = true;
}
// Meta-class metadata generation.
ObjCInterfaceDecl *RootClass = nullptr;
ObjCInterfaceDecl *SuperClass = CDecl->getSuperClass();
while (SuperClass) {
RootClass = SuperClass;
SuperClass = SuperClass->getSuperClass();
}
SuperClass = CDecl->getSuperClass();
Result += "\nstatic struct _objc_class _OBJC_METACLASS_";
Result += CDecl->getNameAsString();
Result += " __attribute__ ((used, section (\"__OBJC, __meta_class\")))= "
"{\n\t(struct _objc_class *)\"";
Result += (RootClass ? RootClass->getNameAsString() : CDecl->getNameAsString());
Result += "\"";
if (SuperClass) {
Result += ", \"";
Result += SuperClass->getNameAsString();
Result += "\", \"";
Result += CDecl->getNameAsString();
Result += "\"";
}
else {
Result += ", 0, \"";
Result += CDecl->getNameAsString();
Result += "\"";
}
// Set 'ivars' field for root class to 0. ObjC1 runtime does not use it.
// 'info' field is initialized to CLS_META(2) for metaclass
Result += ", 0,2, sizeof(struct _objc_class), 0";
if (IDecl->classmeth_begin() != IDecl->classmeth_end()) {
Result += "\n\t, (struct _objc_method_list *)&_OBJC_CLASS_METHODS_";
Result += IDecl->getNameAsString();
Result += "\n";
}
else
Result += ", 0\n";
if (CDecl->protocol_begin() != CDecl->protocol_end()) {
Result += "\t,0, (struct _objc_protocol_list *)&_OBJC_CLASS_PROTOCOLS_";
Result += CDecl->getNameAsString();
Result += ",0,0\n";
}
else
Result += "\t,0,0,0,0\n";
Result += "};\n";
// class metadata generation.
Result += "\nstatic struct _objc_class _OBJC_CLASS_";
Result += CDecl->getNameAsString();
Result += " __attribute__ ((used, section (\"__OBJC, __class\")))= "
"{\n\t&_OBJC_METACLASS_";
Result += CDecl->getNameAsString();
if (SuperClass) {
Result += ", \"";
Result += SuperClass->getNameAsString();
Result += "\", \"";
Result += CDecl->getNameAsString();
Result += "\"";
}
else {
Result += ", 0, \"";
Result += CDecl->getNameAsString();
Result += "\"";
}
// 'info' field is initialized to CLS_CLASS(1) for class
Result += ", 0,1";
if (!ObjCSynthesizedStructs.count(CDecl))
Result += ",0";
else {
// class has size. Must synthesize its size.
Result += ",sizeof(struct ";
Result += CDecl->getNameAsString();
if (LangOpts.MicrosoftExt)
Result += "_IMPL";
Result += ")";
}
if (NumIvars > 0) {
Result += ", (struct _objc_ivar_list *)&_OBJC_INSTANCE_VARIABLES_";
Result += CDecl->getNameAsString();
Result += "\n\t";
}
else
Result += ",0";
if (IDecl->instmeth_begin() != IDecl->instmeth_end()) {
Result += ", (struct _objc_method_list *)&_OBJC_INSTANCE_METHODS_";
Result += CDecl->getNameAsString();
Result += ", 0\n\t";
}
else
Result += ",0,0";
if (CDecl->protocol_begin() != CDecl->protocol_end()) {
Result += ", (struct _objc_protocol_list*)&_OBJC_CLASS_PROTOCOLS_";
Result += CDecl->getNameAsString();
Result += ", 0,0\n";
}
else
Result += ",0,0,0\n";
Result += "};\n";
}
void RewriteObjCFragileABI::RewriteMetaDataIntoBuffer(std::string &Result) {
int ClsDefCount = ClassImplementation.size();
int CatDefCount = CategoryImplementation.size();
// For each implemented class, write out all its meta data.
for (int i = 0; i < ClsDefCount; i++)
RewriteObjCClassMetaData(ClassImplementation[i], Result);
// For each implemented category, write out all its meta data.
for (int i = 0; i < CatDefCount; i++)
RewriteObjCCategoryImplDecl(CategoryImplementation[i], Result);
// Write objc_symtab metadata
/*
struct _objc_symtab
{
long sel_ref_cnt;
SEL *refs;
short cls_def_cnt;
short cat_def_cnt;
void *defs[cls_def_cnt + cat_def_cnt];
};
*/
Result += "\nstruct _objc_symtab {\n";
Result += "\tlong sel_ref_cnt;\n";
Result += "\tSEL *refs;\n";
Result += "\tshort cls_def_cnt;\n";
Result += "\tshort cat_def_cnt;\n";
Result += "\tvoid *defs[" + utostr(ClsDefCount + CatDefCount)+ "];\n";
Result += "};\n\n";
Result += "static struct _objc_symtab "
"_OBJC_SYMBOLS __attribute__((used, section (\"__OBJC, __symbols\")))= {\n";
Result += "\t0, 0, " + utostr(ClsDefCount)
+ ", " + utostr(CatDefCount) + "\n";
for (int i = 0; i < ClsDefCount; i++) {
Result += "\t,&_OBJC_CLASS_";
Result += ClassImplementation[i]->getNameAsString();
Result += "\n";
}
for (int i = 0; i < CatDefCount; i++) {
Result += "\t,&_OBJC_CATEGORY_";
Result += CategoryImplementation[i]->getClassInterface()->getNameAsString();
Result += "_";
Result += CategoryImplementation[i]->getNameAsString();
Result += "\n";
}
Result += "};\n\n";
// Write objc_module metadata
/*
struct _objc_module {
long version;
long size;
const char *name;
struct _objc_symtab *symtab;
}
*/
Result += "\nstruct _objc_module {\n";
Result += "\tlong version;\n";
Result += "\tlong size;\n";
Result += "\tconst char *name;\n";
Result += "\tstruct _objc_symtab *symtab;\n";
Result += "};\n\n";
Result += "static struct _objc_module "
"_OBJC_MODULES __attribute__ ((used, section (\"__OBJC, __module_info\")))= {\n";
Result += "\t" + utostr(OBJC_ABI_VERSION) +
", sizeof(struct _objc_module), \"\", &_OBJC_SYMBOLS\n";
Result += "};\n\n";
if (LangOpts.MicrosoftExt) {
if (ProtocolExprDecls.size()) {
Result += "#pragma section(\".objc_protocol$B\",long,read,write)\n";
Result += "#pragma data_seg(push, \".objc_protocol$B\")\n";
for (ObjCProtocolDecl *ProtDecl : ProtocolExprDecls) {
Result += "static struct _objc_protocol *_POINTER_OBJC_PROTOCOL_";
Result += ProtDecl->getNameAsString();
Result += " = &_OBJC_PROTOCOL_";
Result += ProtDecl->getNameAsString();
Result += ";\n";
}
Result += "#pragma data_seg(pop)\n\n";
}
Result += "#pragma section(\".objc_module_info$B\",long,read,write)\n";
Result += "#pragma data_seg(push, \".objc_module_info$B\")\n";
Result += "static struct _objc_module *_POINTER_OBJC_MODULES = ";
Result += "&_OBJC_MODULES;\n";
Result += "#pragma data_seg(pop)\n\n";
}
}
/// RewriteObjCCategoryImplDecl - Rewrite metadata for each category
/// implementation.
void RewriteObjCFragileABI::RewriteObjCCategoryImplDecl(ObjCCategoryImplDecl *IDecl,
std::string &Result) {
ObjCInterfaceDecl *ClassDecl = IDecl->getClassInterface();
// Find category declaration for this implementation.
ObjCCategoryDecl *CDecl
= ClassDecl->FindCategoryDeclaration(IDecl->getIdentifier());
std::string FullCategoryName = ClassDecl->getNameAsString();
FullCategoryName += '_';
FullCategoryName += IDecl->getNameAsString();
// Build _objc_method_list for class's instance methods if needed
SmallVector<ObjCMethodDecl *, 32> InstanceMethods(IDecl->instance_methods());
// If any of our property implementations have associated getters or
// setters, produce metadata for them as well.
for (const auto *Prop : IDecl->property_impls()) {
if (Prop->getPropertyImplementation() == ObjCPropertyImplDecl::Dynamic)
continue;
if (!Prop->getPropertyIvarDecl())
continue;
ObjCPropertyDecl *PD = Prop->getPropertyDecl();
if (!PD)
continue;
if (ObjCMethodDecl *Getter = PD->getGetterMethodDecl())
InstanceMethods.push_back(Getter);
if (PD->isReadOnly())
continue;
if (ObjCMethodDecl *Setter = PD->getSetterMethodDecl())
InstanceMethods.push_back(Setter);
}
RewriteObjCMethodsMetaData(InstanceMethods.begin(), InstanceMethods.end(),
true, "CATEGORY_", FullCategoryName.c_str(),
Result);
// Build _objc_method_list for class's class methods if needed
RewriteObjCMethodsMetaData(IDecl->classmeth_begin(), IDecl->classmeth_end(),
false, "CATEGORY_", FullCategoryName.c_str(),
Result);
// Protocols referenced in class declaration?
// Null CDecl is case of a category implementation with no category interface
if (CDecl)
RewriteObjCProtocolListMetaData(CDecl->getReferencedProtocols(), "CATEGORY",
FullCategoryName, Result);
/* struct _objc_category {
char *category_name;
char *class_name;
struct _objc_method_list *instance_methods;
struct _objc_method_list *class_methods;
struct _objc_protocol_list *protocols;
// Objective-C 1.0 extensions
uint32_t size; // sizeof (struct _objc_category)
struct _objc_property_list *instance_properties; // category's own
// @property decl.
};
*/
static bool objc_category = false;
if (!objc_category) {
Result += "\nstruct _objc_category {\n";
Result += "\tchar *category_name;\n";
Result += "\tchar *class_name;\n";
Result += "\tstruct _objc_method_list *instance_methods;\n";
Result += "\tstruct _objc_method_list *class_methods;\n";
Result += "\tstruct _objc_protocol_list *protocols;\n";
Result += "\tunsigned int size;\n";
Result += "\tstruct _objc_property_list *instance_properties;\n";
Result += "};\n";
objc_category = true;
}
Result += "\nstatic struct _objc_category _OBJC_CATEGORY_";
Result += FullCategoryName;
Result += " __attribute__ ((used, section (\"__OBJC, __category\")))= {\n\t\"";
Result += IDecl->getNameAsString();
Result += "\"\n\t, \"";
Result += ClassDecl->getNameAsString();
Result += "\"\n";
if (IDecl->instmeth_begin() != IDecl->instmeth_end()) {
Result += "\t, (struct _objc_method_list *)"
"&_OBJC_CATEGORY_INSTANCE_METHODS_";
Result += FullCategoryName;
Result += "\n";
}
else
Result += "\t, 0\n";
if (IDecl->classmeth_begin() != IDecl->classmeth_end()) {
Result += "\t, (struct _objc_method_list *)"
"&_OBJC_CATEGORY_CLASS_METHODS_";
Result += FullCategoryName;
Result += "\n";
}
else
Result += "\t, 0\n";
if (CDecl && CDecl->protocol_begin() != CDecl->protocol_end()) {
Result += "\t, (struct _objc_protocol_list *)&_OBJC_CATEGORY_PROTOCOLS_";
Result += FullCategoryName;
Result += "\n";
}
else
Result += "\t, 0\n";
Result += "\t, sizeof(struct _objc_category), 0\n};\n";
}
// RewriteObjCMethodsMetaData - Rewrite methods metadata for instance or
/// class methods.
template<typename MethodIterator>
void RewriteObjCFragileABI::RewriteObjCMethodsMetaData(MethodIterator MethodBegin,
MethodIterator MethodEnd,
bool IsInstanceMethod,
StringRef prefix,
StringRef ClassName,
std::string &Result) {
if (MethodBegin == MethodEnd) return;
if (!objc_impl_method) {
/* struct _objc_method {
SEL _cmd;
char *method_types;
void *_imp;
}
*/
Result += "\nstruct _objc_method {\n";
Result += "\tSEL _cmd;\n";
Result += "\tchar *method_types;\n";
Result += "\tvoid *_imp;\n";
Result += "};\n";
objc_impl_method = true;
}
// Build _objc_method_list for class's methods if needed
/* struct {
struct _objc_method_list *next_method;
int method_count;
struct _objc_method method_list[];
}
*/
unsigned NumMethods = std::distance(MethodBegin, MethodEnd);
Result += "\nstatic struct {\n";
Result += "\tstruct _objc_method_list *next_method;\n";
Result += "\tint method_count;\n";
Result += "\tstruct _objc_method method_list[";
Result += utostr(NumMethods);
Result += "];\n} _OBJC_";
Result += prefix;
Result += IsInstanceMethod ? "INSTANCE" : "CLASS";
Result += "_METHODS_";
Result += ClassName;
Result += " __attribute__ ((used, section (\"__OBJC, __";
Result += IsInstanceMethod ? "inst" : "cls";
Result += "_meth\")))= ";
Result += "{\n\t0, " + utostr(NumMethods) + "\n";
Result += "\t,{{(SEL)\"";
Result += (*MethodBegin)->getSelector().getAsString().c_str();
std::string MethodTypeString;
Context->getObjCEncodingForMethodDecl(*MethodBegin, MethodTypeString);
Result += "\", \"";
Result += MethodTypeString;
Result += "\", (void *)";
Result += MethodInternalNames[*MethodBegin];
Result += "}\n";
for (++MethodBegin; MethodBegin != MethodEnd; ++MethodBegin) {
Result += "\t ,{(SEL)\"";
Result += (*MethodBegin)->getSelector().getAsString().c_str();
std::string MethodTypeString;
Context->getObjCEncodingForMethodDecl(*MethodBegin, MethodTypeString);
Result += "\", \"";
Result += MethodTypeString;
Result += "\", (void *)";
Result += MethodInternalNames[*MethodBegin];
Result += "}\n";
}
Result += "\t }\n};\n";
}
Stmt *RewriteObjCFragileABI::RewriteObjCIvarRefExpr(ObjCIvarRefExpr *IV) {
SourceRange OldRange = IV->getSourceRange();
Expr *BaseExpr = IV->getBase();
// Rewrite the base, but without actually doing replaces.
{
DisableReplaceStmtScope S(*this);
BaseExpr = cast<Expr>(RewriteFunctionBodyOrGlobalInitializer(BaseExpr));
IV->setBase(BaseExpr);
}
ObjCIvarDecl *D = IV->getDecl();
Expr *Replacement = IV;
if (CurMethodDef) {
if (BaseExpr->getType()->isObjCObjectPointerType()) {
const ObjCInterfaceType *iFaceDecl =
dyn_cast<ObjCInterfaceType>(BaseExpr->getType()->getPointeeType());
assert(iFaceDecl && "RewriteObjCIvarRefExpr - iFaceDecl is null");
// lookup which class implements the instance variable.
ObjCInterfaceDecl *clsDeclared = nullptr;
iFaceDecl->getDecl()->lookupInstanceVariable(D->getIdentifier(),
clsDeclared);
assert(clsDeclared && "RewriteObjCIvarRefExpr(): Can't find class");
// Synthesize an explicit cast to gain access to the ivar.
std::string RecName = clsDeclared->getIdentifier()->getName();
RecName += "_IMPL";
IdentifierInfo *II = &Context->Idents.get(RecName);
RecordDecl *RD = RecordDecl::Create(*Context, TTK_Struct, TUDecl,
SourceLocation(), SourceLocation(),
II);
assert(RD && "RewriteObjCIvarRefExpr(): Can't find RecordDecl");
QualType castT = Context->getPointerType(Context->getTagDeclType(RD));
CastExpr *castExpr = NoTypeInfoCStyleCastExpr(Context, castT,
CK_BitCast,
IV->getBase());
// Don't forget the parens to enforce the proper binding.
ParenExpr *PE = new (Context) ParenExpr(OldRange.getBegin(),
OldRange.getEnd(),
castExpr);
if (IV->isFreeIvar() &&
declaresSameEntity(CurMethodDef->getClassInterface(), iFaceDecl->getDecl())) {
MemberExpr *ME = new (Context)
MemberExpr(PE, true, SourceLocation(), D, IV->getLocation(),
D->getType(), VK_LValue, OK_Ordinary);
Replacement = ME;
} else {
IV->setBase(PE);
}
}
} else { // we are outside a method.
assert(!IV->isFreeIvar() && "Cannot have a free standing ivar outside a method");
// Explicit ivar refs need to have a cast inserted.
// FIXME: consider sharing some of this code with the code above.
if (BaseExpr->getType()->isObjCObjectPointerType()) {
const ObjCInterfaceType *iFaceDecl =
dyn_cast<ObjCInterfaceType>(BaseExpr->getType()->getPointeeType());
// lookup which class implements the instance variable.
ObjCInterfaceDecl *clsDeclared = nullptr;
iFaceDecl->getDecl()->lookupInstanceVariable(D->getIdentifier(),
clsDeclared);
assert(clsDeclared && "RewriteObjCIvarRefExpr(): Can't find class");
// Synthesize an explicit cast to gain access to the ivar.
std::string RecName = clsDeclared->getIdentifier()->getName();
RecName += "_IMPL";
IdentifierInfo *II = &Context->Idents.get(RecName);
RecordDecl *RD = RecordDecl::Create(*Context, TTK_Struct, TUDecl,
SourceLocation(), SourceLocation(),
II);
assert(RD && "RewriteObjCIvarRefExpr(): Can't find RecordDecl");
QualType castT = Context->getPointerType(Context->getTagDeclType(RD));
CastExpr *castExpr = NoTypeInfoCStyleCastExpr(Context, castT,
CK_BitCast,
IV->getBase());
// Don't forget the parens to enforce the proper binding.
ParenExpr *PE = new (Context) ParenExpr(IV->getBase()->getLocStart(),
IV->getBase()->getLocEnd(), castExpr);
// Cannot delete IV->getBase(), since PE points to it.
// Replace the old base with the cast. This is important when doing
// embedded rewrites. For example, [newInv->_container addObject:0].
IV->setBase(PE);
}
}
ReplaceStmtWithRange(IV, Replacement, OldRange);
return Replacement;
}
#endif